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ADDITION USING PARTITIONING PowerPoint PPT Presentation


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ADDITION USING PARTITIONING. The following questions are multiple choice.  When working out these questions mentally you must use the following method. e.g.  48 + 69 = ? 40 + 60 = 100 8 + 9 = 17 100 + 17 = 117 Therefore 48 + 69 = 117 By Auveen Twomey.

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ADDITION USING PARTITIONING

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Addition using partitioning l.jpg

ADDITION USING PARTITIONING

The following questions are multiple choice.  When working out these questions mentally you must use the following method.

e.g.  48 + 69 = ?40 + 60 = 1008 + 9 = 17100 + 17 = 117Therefore 48 + 69 = 117

By Auveen Twomey


Slide2 l.jpg

Task 1Use the method shown previously to answer the following multiple choice questions. Can you explain to a partner how you partitioned each number?

1. 64 + 82 = A. 145B. 146C. 156

2. 37 + 59 =A. 96B. 82C. 94

3. 41 + 74 =A. 85B. 115C. 105

4. 89 + 62 =A. 146B. 151C. 153

5. 37 + 96 =A. 131B. 132C. 133


Answers to task 1 l.jpg

Answers to Task 1

1. 64 + 82 = 146

60 + 80 = 140

4 + 2 = 6

140 + 6 = 146

2. 37 + 59 = 96

30 + 50 = 80

7 + 9 = 16

80 + 16 = 96

3. 41 + 74 = 115

40 + 70 = 110

1 + 4 = 5

110 + 5 = 115


Answers to task 1 continued l.jpg

Answers to Task 1 (continued)

4. 89 + 62 = 151

80 + 60 = 140

9 + 2 = 11

140 + 11 = 151

5. 37 + 96 = 133

30 + 90 = 120

7 + 6 = 13

120 + 13 = 133


Task 2 l.jpg

Task 2

  • Write 4 calculations and work out the answers.

  • Then pass them to your partner (without the answers) to complete.

  • When they have finished mark their work. Remember they must use the PARTITIONING method!


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