Unit 2: Addition

Topic B: Addition of Three or More Numbers

To add three or more numbers together, use the following steps.

  1. Add the first two numbers together.
  2. Add that sum to the next number.
  3. Add that sum to the next number (if needed).

Example A:

[latex]\begin{align} 6\\ 1\\ +3\\ \hline \\ \end{align}[/latex]

  1. Add the first two numbers together.
    [latex]\begin{align} 6 \\ +1\\ \hline 7 \end{align}[/latex]
  2. Add that sum to the next number.
    [latex]\begin{align} 7\\ +3 \\ \hline 10 \end{align}[/latex]

The sum of:

[latex]\begin{align} 6 \\ 1\\ +3\\ \hline 10 \end{align}[/latex]

Example B: 

[latex]\begin{align} 4\\ 5\\ +7\\ \hline \\ \end{align}[/latex]

  1. Add the first two numbers together.
    [latex]\begin{align} 4\\ +5\\ \hline 9 \end{align}[/latex]
  2. Add that sum to the third number.
    [latex]\begin{align} 9\\ +7\\ \hline 16 \end{align}[/latex]

The sum of:

[latex]\begin{align} 4\\ 5\\ +7\\ \hline 16 \end{align}[/latex]

Exercise 1

Find the sums. Check your work using the answer key at the end of the exercise.

  1. [latex]\begin{align} 1\\ 2\\ +5\\ \hline \\ \end{align}[/latex]
  2. [latex]\begin{align} 6\\ 3\\ +2\\ \hline \\ \end{align}[/latex]
  3. [latex]\begin{align} 7\\ 1\\ +6\\ \hline \\ \end{align}[/latex]
  4. [latex]\begin{align} 3\\ 6\\ +5\\ \hline \\ \end{align}[/latex]
  5. [latex]\begin{align} 8\\ 1\\ +4\\ \hline \\ \end{align}[/latex]
  6. [latex]\begin{align} 5\\ 4\\ +8\\ \hline \\ \end{align}[/latex]
  7. [latex]\begin{align} 1\\ 5\\ +7\\ \hline \\ \end{align}[/latex]
  8. [latex]\begin{align} 7\\ 2\\ +5\\ \hline \\ \end{align}[/latex]
  9. [latex]\begin{align} 1\\ 8\\ +3\\ \hline \\ \end{align}[/latex]
  10. [latex]\begin{align} 4\\ 5\\ +9\\ \hline \\ \end{align}[/latex]
  11. [latex]\begin{align} 2\\ 2\\ +8\\ \hline \\ \end{align}[/latex]
  12. [latex]\begin{align} 6\\ 3\\ +5\\ \hline \\ \end{align}[/latex]
  13. [latex]\begin{align} 7\\ 2\\ +5\\ \hline \\ \end{align}[/latex]
  14. [latex]\begin{align} 3\\ 2\\ +5\\ \hline \\ \end{align}[/latex]
  15. [latex]\begin{align} 6\\ 2\\ +5\\ \hline \\ \end{align}[/latex]
  16. [latex]\begin{align} 4\\ 4\\ +5\\ \hline \\ \end{align}[/latex]

Answers to Exercise 1

  1. 8
  2. 11
  3. 14
  4. 14
  5. 13
  6. 17
  7. 13
  8. 14
  9. 12
  10. 18
  11. 12
  12. 14
  13. 14
  14. 10
  15. 13
  16. 13

Exercise 2

Find the sums. Check your work using the answer key at the end of the exercise.

  1. [latex]\begin{align} 3\\ 5\\ +7\\ \hline \\ \end{align}[/latex]
  2. [latex]\begin{align} 2\\ 6\\ +8\\ \hline \\ \end{align}[/latex]
  3. [latex]\begin{align} 4\\ 1\\ +9\\ \hline \\ \end{align}[/latex]
  4. [latex]\begin{align} 5\\ 4\\ +2\\ \hline \\ \end{align}[/latex]
  5. [latex]\begin{align} 3\\ 6\\ +4\\ \hline \\ \end{align}[/latex]
  6. [latex]\begin{align} 2\\ 5\\ +4\\ \hline \\ \end{align}[/latex]
  7. [latex]\begin{align} 6\\ 3\\ +2\\ \hline \\ \end{align}[/latex]
  8. [latex]\begin{align} 3\\ 5\\ +3\\ \hline \\ \end{align}[/latex]
  9. [latex]\begin{align} 3\\ 4\\ +7\\ \hline \\ \end{align}[/latex]
  10. [latex]\begin{align} 4\\ 5\\ +9\\ \hline \\ \end{align}[/latex]
  11. [latex]\begin{align} 6\\ 3\\ +2\\ \hline \\ \end{align}[/latex]
  12. [latex]\begin{align} 5\\ 2\\ +9\\ \hline \\ \end{align}[/latex]

Answers to Exercise 2

  1. 15
  2. 16
  3. 14
  4. 11
  5. 13
  6. 11
  7. 11
  8. 11
  9. 14
  10. 18
  11. 11
  12. 16

Exercise 3

Find the sums. Check your work using the answer key at the end of the exercise.

  1. [latex]\begin{align} 3\\ 2\\ +8\\ \hline \\ \end{align}[/latex]
  2. [latex]\begin{align} 2\\ 1\\ +4\\ \hline \\ \end{align}[/latex]
  3. [latex]\begin{align} 4\\ 3\\ +1\\ \hline \\ \end{align}[/latex]
  4. [latex]\begin{align} 1\\ 2\\ +8\\ \hline \\ \end{align}[/latex]
  5. [latex]\begin{align} 3\\ 2\\ +2\\ \hline \\ \end{align}[/latex]
  6. [latex]\begin{align} 5\\ 1\\ +2\\ \hline \\ \end{align}[/latex]
  7. [latex]\begin{align} 7\\ 2\\ +8\\ \hline \\ \end{align}[/latex]
  8. [latex]\begin{align} 4\\ 2\\ +6\\ \hline \\ \end{align}[/latex]
  9. [latex]\begin{align} 7\\ 2\\ +7\\ \hline \\ \end{align}[/latex]
  10. [latex]\begin{align} 6\\ 1\\ +1\\ \hline \\ \end{align}[/latex]
  11. [latex]\begin{align} 2\\ 7\\ +6\\ \hline \\ \end{align}[/latex]
  12. [latex]\begin{align} 3\\ 4\\ +2\\ \hline \\ \end{align}[/latex]
  13. [latex]\begin{align} 3\\ 4\\ +1\\ \hline \\ \end{align}[/latex]
  14. [latex]\begin{align} 7\\ 1\\ +9\\ \hline \\ \end{align}[/latex]
  15. [latex]\begin{align} 2\\ 6\\ +4\\ \hline \\ \end{align}[/latex]
  16. [latex]\begin{align} 3\\ 1\\ +2\\ \hline \\ \end{align}[/latex]

Answers to Exercise 3

  1. 13
  2. 7
  3. 8
  4. 11
  5. 7
  6. 8
  7. 17
  8. 12
  9. 16
  10. 8
  11. 15
  12. 9
  13. 8
  14. 17
  15. 12
  16. 6

Exercise 4

Find the sums. Check your work using the answer key at the end of the exercise.

  1. [latex]\begin{align} 1\\ 3\\ 4\\ +5\\ \hline \\ \end{align}[/latex]
  2. [latex]\begin{align} 2\\ 3\\ 4\\ +6\\ \hline \\ \end{align}[/latex]
  3. [latex]\begin{align} 4\\ 3\\ 2\\ +8\\ \hline \\ \end{align}[/latex]
  4. [latex]\begin{align} 3\\ 1\\ 5\\ +6\\ \hline \\ \end{align}[/latex]
  5. [latex]\begin{align} 2\\ 2\\ 3\\ +2\\ \hline \\ \end{align}[/latex]
  6. [latex]\begin{align} 3\\ 3\\ 1\\ +2\\ \hline \\ \end{align}[/latex]
  7. [latex]\begin{align} 2\\ 1\\ 2\\ +4\\ \hline \\ \end{align}[/latex]
  8. [latex]\begin{align} 1\\ 2\\ 4\\ +6\\ \hline \\ \end{align}[/latex]
  9. [latex]\begin{align} 2\\ 4\\ 1\\ +6\\ \hline \\ \end{align}[/latex]
  10. [latex]\begin{align} 3\\ 2\\ 3\\ +3\\ \hline \\ \end{align}[/latex]
  11. [latex]\begin{align} 2\\ 1\\ 4\\ +0\\ \hline \\ \end{align}[/latex]
  12. [latex]\begin{align} 3\\ 1\\ 4\\ +1\\ \hline \\ \end{align}[/latex]

Answers to Exercise 4

  1. 13
  2. 15
  3. 17
  4. 15
  5. 9
  6. 9
  7. 9
  8. 13
  9. 13
  10. 11
  11. 7
  12. 9

Perimeter

Did you spot the fact that each answer in the word problems before had a unit of measure? A unit of measure just tells you what you measured. Units of measure can be pages, fish, cans, kilometres, meters, centimetres, litres, millilitres, grams, or kilograms. When you answer a word problem, you must include the unit of measure in your answer.

Try the following questions. Be sure to include the unit of measure in your answer.

Perimeter means distance around. To find the perimeter of a shape, find the lengths of the sides and add them together.

Example: RectangleA rectangle. The length of the sides are 3 metres, 2 metres, 3 metres and two metres.

To find the perimeter, add the lengths of the sides of the rectangle.

  • Perimeter = 3 + 2 + 3 + 2
  • Perimeter = 10 meters

Exercise 5

Find the perimeter of each figure. Be sure to include the units of measure in your answer. Check your work using the answer key at the end of the exercise.

  1. Find the perimeter of the swimming pool.
    a rectangular-shape swimming pool whose sides are 3 metres, four metres, three metres and four metres.
  2. Find the perimeter of the garden.
    a triangle shape garden whose sides are 3 metres, 4 metres and 6 metres
  3. Find the perimeter of the greenhouse.
    a square-shape greenhouse whose sides are 3 metres long
  4. Find the perimeter of the sign.
    a rectangular shape sign whose sides are 2 metres, 3 metres, 2 metres, and 3 metres

Answers to Exercise 5

  1. 14 metres
  2. 13 metres
  3. 12 metres
  4. 10 metres

Topic B Self-Test

Mark      /18        Aim      15/18

  1. Find the sums. Be sure to check your answers. (12 marks)
    1. [latex]\begin{align} 4\\ 6\\ +2\\ \hline \end{align}[/latex]
    2. [latex]\begin{align} 3\\ 6\\ +9\\ \hline \end{align}[/latex]
    3. [latex]\begin{align} 7\\ 2\\ +8\\ \hline \end{align}[/latex]
    4. [latex]\begin{align} 2\\ 1\\ +4\\ \hline \end{align}[/latex]
    5. [latex]\begin{align} 3\\ 5\\ +8\\ \hline \end{align}[/latex]
    6. [latex]\begin{align} 4\\ 6\\ +7\\ \hline \end{align}[/latex]
    7. [latex]\begin{align} 3\\ 1\\ 5\\ +2\\ \hline \end{align}[/latex]
    8. [latex]\begin{align} 4\\ 2\\ 3\\ +7\\ \hline \end{align}[/latex]
    9. [latex]\begin{align} 5\\ 3\\ 1\\ +8\\ \hline \end{align}[/latex]
    10. [latex]\begin{align} 3\\ 5\\ 1\\ +3\\ \hline \end{align}[/latex]
    11. [latex]\begin{align} 1\\ 5\\ 4\\ +6\\ \hline \end{align}[/latex]
    12. [latex]\begin{align} 2\\ 1\\ 6\\ +5\\ \hline \end{align}[/latex]
  2. Solve each of the following word problems. Be sure to include the unit of measure in your answer. Be sure to circle the information and underline what’s being asked.(6 marks, 2 marks each)
    1. It took the cleanup crew 4 hours on Monday, 3 hours on Tuesday and 9 hours on Wednesday to clean the factory after each day’s work. How many hours in total did it take to clean the factory?
    2. Nella wants to put a fence around her garden. The garden measures 5 metres, 3 metres and 1 metre. How much fence does she need?
    3. Find the perimeter of the garden.
      a rectangular shape garden whose sides are 4 metres, 2 metres, 4 metres and 2 metres

Answers to Topic B Self-Test

    1. 12
    2. 18
    3. 17
    4. 7
    5. 16
    6. 17
    7. 11
    8. 16
    9. 17
    10. 12
    11. 16
    12. 14
    1. 16 hours
    2. 9 metres
    3. 12 metres

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Adult Literacy Fundamentals Mathematics: Book 1 - 2nd Edition by Wendy Tagami and Liz Girard is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted.

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