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ADDING UP. CATEGORY 1 Adding Up strategy : The whole number is a multiple of ten or one hundred. The subtrahend is close to a multiple of ten or a landmark.

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Presentation on theme: "ADDING UP. CATEGORY 1 Adding Up strategy : The whole number is a multiple of ten or one hundred. The subtrahend is close to a multiple of ten or a landmark."— Presentation transcript:

1 ADDING UP

2 CATEGORY 1 Adding Up strategy : The whole number is a multiple of ten or one hundred. The subtrahend is close to a multiple of ten or a landmark number.

3 20 – – – 9 20 – 8

4 30 – – – – 12

5 40 – – – – 19

6 50 – – – – 24

7 60 – – – – 29

8 70 – – – – 34

9 80 – – – – 39

10 90 – – – – 44

11 100 – – – – 44

12 CATEGORY 2 Adding Up strategy : The whole number is a multiple of ten or one hundred. The subtrahend is close to a multiple of ten or a landmark number.

13 100 – – – – 37

14 150 – – – – 99

15 250 – – – – 149

16 300 – – – – 149

17 400 – – – – 199

18 500 – – – – 249

19 750 – – – – 324

20 1000 – – – – 499

21 CATEGORY 3 Adding Up strategy : The whole number is NO longer an exact multiple of ten or one hundred. The subtrahend is farther distance from the whole.

22 50 – – – 37

23 80 – – – – 36

24 70 – – – – 39

25 100 – – – – 83

26 100 – – – – 89

27 200 – – – – 198

28 300 – – – – 287

29 400 – – – – 298

30 500 – – – – 671


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