Counting Back
Near Doubles
Split Strategy (Partitioning)
Jump Strategy
Inverse Operations
100

9-5

4

100

4+5

9

100

10+4

14

100

10-4

6

100

3+🟥=7

4

200
18-6

12

200

10+11

21

200

12+8

20

200

22-8

14

200

10+🟥=15

5

300

24-7

17

300

13+14

27

300

13+26

39

300

35-14

21

300

12+🟥=18

6

400

45-8

37

400

15+16

31

400

47+39

86

400

 67-38

29

400

22+🟥=32

10

500

154-17

137

500

25+24

49

500

169+237

406

500

158-61

97

500

46+🟥=70

24

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