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Mental Subtraction

English 10 Public

I have looked at the numbers carefully. If the numbers are close together, I can count forward. If the numbers are far apart I can count back.

Study Slideshow

13 - 4

9

10

11-9

2

10

33-12

21

10

22-18

4

10

22-5

17

15

21-19

2

15

65-57

8

15

98- 36

62

20

136-8

128

20

105 -97

8

25