Unit 2: Addition
Topic A: Addition
Addition puts amounts together. The answer of addition is called the sum or the total.
The plus sign + means to add.
3 + 2 = 5 says three plus two equals five or three and two is five.
The sum is 5.
Exercise One
Check out your addition facts by doing this exercise as quickly as possible without counting. The highest total or sum (what the numbers add up to) for these number facts is 20. Check your work using the answer key at the end of the exercise. Then, make a list of any addition facts you do not know or which are slow – practice them. If you feel you need more practice, see your instructor.
- [latex]\begin{array}[t]{rr}&6 \\+& 7\\ \hline&13\end{array}[/latex]
- [latex]\begin{array}[t]{rr}&8\\+& 3\\ \hline&11\end{array}[/latex]
- [latex]\begin{array}[t]{rr}&4\\ +& 2\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&8\\ + &7 \\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&1\\ +& 2 \\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&6\\ +& 4 \\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&5\\ +& 8 \\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&2\\+& 5 \\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&7\\ + &6\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&0\\ +&3\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&9\\ + &7 \\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&7\\ +& 2 \\ \hline\\ \end{array}[/latex]
Answers to Exercise One
- 13
- 11
- 6
- 15
- 3
- 10
- 13
- 7
- 13
- 3
- 16
- 9
Addition of Larger Numbers
Use these steps to complete each addition question.
- Step 1: Add the ones to the ones.
- Step 2: Add the tens to the tens.
- Step 3: Add the hundreds to the hundreds.
- Step 4: Add the thousands to the thousands.
- Step 5: Add the ten thousands to the ten thousands.
Example A: 23 + 56 =
Step 1: Add the ones to the ones. 3 ones + 6 ones = 9 ones
[latex]\begin{array}[t]{rr}&23\\+&56\\ \hline&9\end{array}[/latex]
Write the answer in line with the ones in the question.
Step 2: Add the tens. 2 tens + 5 tens = 7 tens
[latex]\begin{array}[t]{rr}&23\\+ &56\\ \hline&79\end{array}[/latex]
The sum of 23 + 56 = 79
Exercise Two
Find the sums. Check your work using the answer key at the end of the exercise.
- [latex]\begin{array}[t]{rr}&37\\+&42\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&55\\+&22\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&70\\+&17\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&27\\+&32\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&87\\+&12\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&33\\+&64\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&44\\+&50\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&34\\+&11\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&51\\+&23\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&12\\+&46\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&17\\+&21\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&70\\+&28\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&54\\+&23\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&62\\+&14\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&15\\+&12\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&45\\+&23\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&23\\+&64\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&53\\+&42\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&60\\+&23\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&49\\+&10\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&75\\+&13\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&58\\+&21\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&31\\+&28\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&24\\+&13\\ \hline\\ \end{array}[/latex]
Answers to Exercise Two
- 79
- 77
- 87
- 59
- 99
- 97
- 94
- 45
- 74
- 58
- 38
- 98
- 77
- 76
- 27
- 68
- 87
- 95
- 83
- 59
- 88
- 79
- 59
- 37
Exercise Three
Find the sums. Check your work using the answer key at the end of the exercise.
- [latex]\begin{array}[t]{rr}&32\\+&64\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&23\\+&54\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&61\\+&22\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&83\\+&11\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&32\\+&45\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&63\\+&33\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&75\\+&24\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&46\\+&12\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&44\\+&35\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&25\\+&42\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&41\\+&38\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&54\\+&45\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&25\\+&32\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&35\\+&42\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&32\\+&44\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&22\\+&14\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&57\\+&21\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&42\\+&54\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&34\\+&23\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&25\\+&42\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&13\\+&41\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&60\\+&25\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&34\\+&62\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&77\\+&21\\ \hline\\ \end{array}[/latex]
Answers to Exercise Three
- 96
- 77
- 83
- 94
- 77
- 96
- 99
- 58
- 79
- 67
- 79
- 99
- 57
- 77
- 76
- 36
- 78
- 96
- 57
- 67
- 54
- 85
- 96
- 98
To add three or more numbers together, use the following steps.
- Step 1: Add the ones to the ones.
- Step 2: Add the tens to the tens.
- Step 3: Add the hundreds to the hundreds.
- Step 4: Add the thousands to the thousands.
- Step 5: Add the ten thousands to the ten thousands.
Example B: 24 + 52 + 73=
Step 1: Add the ones. 4 ones + 2 ones + 3 ones = 9 ones
[latex]\begin{array}[t]{rr}&24\\&52\\+&73\\ \hline&9\end{array}[/latex]
Step 2: Add the tens. 2 tens + 5 tens + 7 ten = 14 tens
[latex]\begin{array}[t]{rr}&24\\&52\\+&73\\ \hline&149\end{array}[/latex]
Exercise Four
- [latex]\begin{array}[t]{rr}&21\\&34\\+&44\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&11\\&61\\+&15\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&23\\&35\\+&41\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&20\\&43\\+&36\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&13\\&42\\+&34\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&33\\&64\\+&22\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&44\\&50\\+&24\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&37\\&42\\+&10\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&55\\&24\\+&30\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&82\\&17\\+&50\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&45\\&32\\+&52\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&70\\&21\\+&48\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&12\\&54\\+&62\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&25\\&61\\+&22\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&32\\&23\\+&94\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&33\\&55\\+&21\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&31\\&12\\+&85\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&41\\&31\\+&87\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&17\\&42\\+&50\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&56\\&31\\+&82\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&32\\&45\\+&51\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&24\\&65\\+&30\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&51\\&27\\+&41\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&22\\&14\\+&31\\ \hline\\ \end{array}[/latex]
Answers to Exercise Four
- 99
- 87
- 99
- 99
- 89
- 119
- 118
- 89
- 109
- 149
- 129
- 139
- 128
- 108
- 149
- 109
- 128
- 159
- 109
- 169
- 128
- 119
- 119
- 67
Exercise Five
Find the sums. Check your work using the answer key at the end of the exercise.
- [latex]\begin{array}[t]{rr}&32\\&53\\+&14\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&42\\&25\\+&11\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&24\\&81\\+&13\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&52\\&24\\+&63\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&54\\&23\\+&71\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&25\\&60\\+&84\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&41\\&32\\+&96\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&31\\&43\\+&85\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&15\\&52\\+&82\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&43\\&21\\+&52\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&81\\&16\\+&42\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&56\\&31\\+&92\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&37\\&12\\+&80\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&63\\&25\\+&70\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&70\\&24\\+&65\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&25\\&41\\+&73\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&41\\&66\\+&32\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&24\\&33\\+&62\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&52\\&45\\+&21\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&71\\&16\\+&42\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&64\\&12\\+&90\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&55\\&21\\+&43\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&26\\&61\\+&82\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&44\\&53\\+&31\\ \hline\\ \end{array}[/latex]
Answers to Exercise Five
- 99
- 78
- 118
- 139
- 148
- 169
- 169
- 159
- 149
- 116
- 139
- 179
- 129
- 158
- 159
- 139
- 139
- 119
- 118
- 129
- 166
- 119
- 169
- 128
Use these steps to complete each addition question.
- Step 1: Add the ones to the ones.
- Step 2: Add the tens to the tens.
- Step 3: Add the hundreds to the hundreds.
Example C: 372 + 415
Step 1: Add the ones. 2 ones + 5 ones = 7 ones
[latex]\begin{array}[t]{rr}&372\\+&415\\ \hline& 7\end{array}[/latex]
Step 2: Add the tens. 7 tens + 1 ten = 8 tens
[latex]\begin{array}[t]{rr}&372\\+&415\\ \hline&87 \end{array}[/latex]
Step 3: Add the hundreds. 3 hundreds + 4 hundreds = 7 hundreds
[latex]\begin{array}[t]{rr}&372\\+&415\\ \hline&787 \end{array}[/latex]
Exercise Six
Find the sums. Check your work using the answer key at the end of the exercise.
- [latex]\begin{array}[t]{rr}&324\\+&865\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&514\\+&274\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&673\\+&326\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&603\\+&375\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&174\\+&922\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&250\\+&618\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&506\\+&182\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&514\\+&482\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&738\\+&510\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&321\\+&358\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&215\\+&584\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&416\\+&352\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&167\\+&522\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&315\\+&573\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&156\\+&732\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&713\\+&256\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&135\\+&564\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&105\\+&632\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&253\\+&644\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&535\\+&442\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&168\\+&421\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&834\\+&162\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&422\\+&361\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&327\\+&462\\ \hline\\ \end{array}[/latex]
Answers to Exercise Six
- 1189
- 788
- 999
- 978
- 1096
- 868
- 688
- 996
- 1248
- 679
- 799
- 768
- 689
- 888
- 888
- 969
- 699
- 737
- 897
- 977
- 589
- 996
- 783
- 789
Exercise Seven
Find the sums. Check your work using the answer key at the end of the exercise.
- [latex]\begin{array}[t]{rr}&754\\+&231\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&410\\+&257\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&653\\+&142\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&815\\+&170\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&243\\+&146\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&615\\+&303\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&124\\+&762\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&451\\+&206\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&705\\+&261\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&627\\+&512\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&357\\+&130\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&725\\+&273\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&753\\+&902\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&425\\+&203\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&652\\+&137\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&357\\+&132\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&675\\+&214\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&802\\+&254\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&524\\+&321\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&723\\+&306\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&243\\+&152\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&145\\+&213\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&262\\+&321\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&525\\+&131\\ \hline\\ \end{array}[/latex]
Answers to Exercise Seven
- 985
- 667
- 795
- 985
- 389
- 918
- 886
- 657
- 966
- 1139
- 487
- 998
- 1 655
- 628
- 789
- 489
- 889
- 1056
- 845
- 1029
- 395
- 358
- 583
- 656
To add three or more numbers together, use the following steps.
- Step 1: Add the ones to the ones.
- Step 2: Add the tens to the tens.
- Step 3: Add the hundreds to the hundreds.
Example D: 372 + 415 + 210
Step 1: Add the ones. 2 ones + 5 ones + 0 ones = 7 ones
[latex]\begin{array}[t]{rr}&372\\&415\\+&210\\ \hline&7 \end{array}[/latex]
Step 2: Add the tens. 7 tens + 1 ten + 1 ten = 9 tens
[latex]\begin{array}[t]{rr}&372\\&415\\+&210\\ \hline&97 \end{array}[/latex]
Step 3: Add the hundreds. 3 hundreds + 4 hundreds + 2 hundreds = 9 hundreds
[latex]\begin{array}[t]{rr}&372\\&415\\+&210\\ \hline&997 \end{array}[/latex]
Exercise Eight
- [latex]\begin{array}[t]{rr}&345\\&132\\+&421\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&524\\&630\\+&721\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&305\\&131\\+&422\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&214\\&341\\+&932\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&821\\&324\\+&423\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&353\\&301\\+&624\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&435\\&201\\+&160\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&641\\&322\\+&833\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&132\\&254\\+&413\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&713\\&102\\+&860\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&245\\&321\\+&803\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&341\\&215\\+&840\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&524\\&243\\+&122\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&253\\&114\\+&321\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&272\\&315\\+&410\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&514\\&231\\+&620\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&246\\&351\\+&502\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&152\\&331\\+&216\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&164\\&233\\+&801\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&414\\&231\\+&552\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&362\\&627\\+&510\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&264\\&535\\+&600\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&432\\&653\\+&313\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&631\\&216\\+&552\\ \hline\\ \end{array}[/latex]
Answers to Exercise Eight
- 898
- 1875
- 858
- 1487
- 1568
- 1278
- 796
- 1796
- 799
- 1675
- 1369
- 1396
- 889
- 688
- 997
- 1365
- 1099
- 699
- 1198
- 1197
- 1499
- 1399
- 1398
- 1399
Did you Know?
Some people like to check their addition by adding a second time, starting with the bottom number instead of the top number. For example.
[latex]\begin{array}[t]{rr}&63\\&+35\\ \hline&98 \end{array}[/latex]
Add: [latex]\begin{array}[t]{r}3+5=8\\ 6+3=9\end{array}[/latex]
Check: [latex]\begin{array}[t]{r}5+3=8\\ 3+6=9\end{array}[/latex]
Exercise Nine
Find the sums. Check your addition a second time by starting at the bottom. Place a check mark (√) beside your answer after you have added from the bottom to the top. Check your work using the answer key at the end of the exercise.
- [latex]\begin{array}[t]{rr}&7\,003 \\+& 2\,692\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&6\,217\\+& 3\,732\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&2\,271 \\+& 3\,618\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&5\,992 \\+& 3\,006\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&4\,235 \\+& 1\,162\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&6\,518\\+& 2\,050\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&1\,023\\+& 1\,553\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&4\,034 \\+& 2\,853\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&5\,234\\+& 1\,244\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&41\,738\\+& 38\,051\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&20\,295\\+& 46\,503\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&62\,041 \\+& 12\,857\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&73\,104 \\+& 21\,620\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&40\,835 \\+& 25\,034\\ \hline\\ \end{array}[/latex]
Answers to Exercise Nine
- 9695
- 9949
- 5889
- 8998
- 5397
- 8568
- 2576
- 6887
- 6478
- 79789
- 66798
- 74898
- 94724
- 65869
If an addition question is written with the numbers side by side, rewrite the question in columns. Put the ones under the ones, the tens under the tens, the hundreds under the hundreds, and so on.
Example E: 263 + 25
[latex]\begin{array}[t]{rr}&263\\+&25\\ \hline &288\end{array}[/latex]
Example F: 316 + 9 560
[latex]\begin{array}[t]{rr}&316\\+&9560\\ \hline &9876\end{array}[/latex]
Exercise Ten
Rewrite each question in columns and find the total. Check your work using the answer key at the end of the exercise.
- 75 + 512
- 372 + 16
- 691 + 8
- 4 + 275
- 3457 + 112
- 2403 + 340
- 730 + 422 + 36
- 24 + 333 + 442
- 3000 + 24132 + 70534
- 34511 + 3012 + 40234
Answers to Exercise Ten
- 587
- 388
- 699
- 279
- 3569
- 2743
- 1188
- 799
- 97666
- 77757
Topic A: Self-Test
Mark /22 Aim 17/22
- Find the sums. Be sure to check your answers. (6 marks)
- [latex]\begin{array}[t]{rr}&63\\+&25\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&15\\+&72\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&43\\+&54\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&42\\&33\\+&14\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&34\\&22\\+&52\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&21\\&46\\+&72\\ \hline\\ \end{array}[/latex]
- Find the sums. Be sure to check your answers. (6 marks)
- [latex]\begin{array}[t]{rr}&421\\+&354\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&832\\+&162\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&956\\+&730\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&375\\&213\\+&611\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&211\\&351\\+&515\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&731\\&245\\+&312\\ \hline\\ \end{array}[/latex]
- Find the sums. Be sure to check your answers. (6 marks)
- [latex]\begin{array}[t]{rr}&4\,235\\+& 4\,730\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&6\,513\\+& 4\,182\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&8\,250\\+& 3\,647\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&51\,672\\+& 36\,124\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&25\,146\\+& 43\,503\\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&42\,196\\+& 70\,301\\ \hline\\ \end{array}[/latex]
- Add these numbers. (4 marks)
- [latex]\begin{array}[t]{rr}&45 \\ &21\\+& 32 \\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&242 \\&325\\+& 112 \\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&8\,013 \\& 1\,246 \\+& 5\,430 \\ \hline\\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&5\,214 \\ &40\,230 \\+& 2\,345\\ \hline\\ \end{array}[/latex]
Answers to Topic A Self-Test
-
- 88
- 87
- 97
- 89
- 108
- 139
-
- 775
- 994
- 1686
- 1199
- 1077
- 1288
-
- 8965
- 10695
- 11897
- 87796
- 68649
- 112497
-
- 98
- 679
- 14689
- 47789