Unit 1: Number Sense

# Unit 1 Review: Number Sense

You will now practice all the skills you learned in Unit 1. Check your work using the answer key at the end of the review.

1. Write the place value names (ones, tens, hundreds, thousands, ten thousands, hundred thousands, millions) for each bolded digit.
1. 4392
2. 765
3. 18293
4. 56428
5. 3641758
6. 426153
7. 8429576
8. 4258
2. Using the number 349285106, write the digit that is in each of the following place values.
1. millions
2. ones
3. ten thousands
4. thousands
5. hundreds
6. hundreds thousands
7. tens
3. Underline the digit for the place value named.
1. hundreds,    5321
2. tens,    8703
3. ten thousands,    34891
4. hundred thousands,    891402
5. thousands,    72491
6. millions,    4201856
4. Write the word names for the numbers.
1. 818
2. 1678
3. 29764
4. 1984152
5. 42803
6. 226917
5. Write the numerals for these word names.
1. twenty-five thousand one hundred thirty-two
2. one thousand two hundred seven
3. two hundred fifteen thousand twenty-four
4. one million six hundred ninety-five thousand four hundred twenty
5. seven hundred twenty-six
6. nine thousand four
6. Write each number in expanded form.
1. 184
2. 3908
3. 61281
4. 1539587
5. 366524
7. Write each number from expanded form.
1. 50000  +  6000  + 600  +  90  + 8
2. 200000  +  70000  +  8000  +  200  +  60  + 1
3. 3000  +  800  +  80  + 5
4. 1000000 + 400000 + 70000 + 6000 + 100 + 50 + 3
5. 700  +  1
8. Arrange these numbers in order from smallest to largest.
1. 18; 34937; 727; 1487; 147832
2. 769; 6790; 697; 76976; 76796
9. Write <, >, or = in each blank as needed.
1. 9698          6899
2. 7542         7452
3. 34682         39421
4. 124693         124693
5. 738423         783423
6. 45832         54123
10. Round each number to the nearest hundred.
1. 774
2. 2581
3. 21204
4. 692
5. 572098
6. 7652931
11. Round each number to the nearest thousand.
1. 948
2. 75767
3. 288869
4. 479
5. 3976
6. 5012
12. Round each number to the nearest ten thousand.
1. 4028
2. 226917
3. 126804
4. 9794487
5. 87805
6. 5912
13. Round each number to the nearest hundred thousand.
1. 687029
2. 1326876
3. 523715
4. 4766883
5. 8182390
6. 792013
14. Round each number to the nearest million.
1. 1009627
2. 28101052
3. 894063
4. 9778656
5. 80379591
6. 3102975
15. Word Problems.
1. The three heaviest sharks are the whale shark weighing 30500 kilograms. The basking shark weighing 9258 kilograms. The great white shark weighing 3507 kilograms. Round each number to the nearest thousand.
Shark Number Rounded Number
Whale shark
Great White Shark
2. Three of the largest islands in the world are New Guinea covering 785753 square kilometers, Baffin Island covering 503944 square kilometers and Honshu Island covering 227413 square kilometers. Round each number to the nearest ten thousand.
Island Number Rounded Number
New Guinea
Baffin Island
Honshu Island

# Answers to Unit 1 Review – Number Sense

1.  tens
2. ones
3. thousands
4. hundreds
5. hundred thousands
6. ten thousands
7. millions
8. thousands
1. 2
2. 6
3. 8
4. 5
5. 1
6. 2
7. 0
1. 5321
2. 8703
3. 34891
4. 891402
5. 72491
6. 4201856
1. eight hundred eighteen
2. one thousand six hundred seventy-eight
3. twenty-nine thousand seven hundred sixty-four
4. one million nine hundred eighty-four thousand one hundred fifty-two
5. forty-two thousand eight hundred three
6. two hundred twenty-six thousand nine hundred seventeen
1. 25132
2. 1207
3. 215024
4. 1695420
5. 726
6. 9004
1. 100 + 80 + 4
2. 3000 + 900 + 8
3. 60000 + 1000 + 200 + 80 + 1
4. 1000000 + 500000 + 30000 + 9000 + 500 + 80 + 7
5. 300 000 + 60 000 + 6 000 + 500 + 20 + 4
1. 56698
2. 278261
3. 3885
4. 1476153
5. 701
1. 18,  727,  1487,  34937,  147832
2. 697,  769,  6790,  76796,  76976
1. >
2. >
3. <
4. =
5. <
6. <
1. 800
2. 2600
3. 21200
4. 700
5. 572100
6. 7652900
1. 1000
2. 76000
3. 289000
4. 0
5. 4000
6. 5000
1. 0
2. 230000
3. 130000
4. 9790000
5. 90000
6. 10000
1. 700000
2. 1300000
3. 500000
4. 4800000
5. 8200000
6. 800000
1. 1000000
2. 28000000
3. 1000000
4. 10000000
5. 80000000
6. 3000000
1. Shark Number Rounded Number
Whale shark 30500 31000
Great White Shark 3507 4000
2. Kilometers Number Rounded Number
New Guinea 785753 790000
Baffin Island 503944 500000
Honshu Island 227413 230000

CONGRATULATIONS!!

Now you have finished Unit 1.

TEST TIME!