Fast Addition
Fast Subtraction
RANDOM!
Adding 10
Taking away 10
100

2+3

5

100

5-1

4

100

1+1

2

100

10+7

17

100

40-10

30


200

4+8

12

200

7-2

5

200

10+2

12

200

20+10

30


200

27-10

17


300

5+6

11

300
8-4

4

300

5+9

14

300

9+10

19

300

36-10

16

400

7+8

15

400
9-8

1

400

6-3

3

400

32+10

42

400

18-10

8

500

9+3

12

500

10-6

4

500

20+20

40

500

50+10

60

500

65-10

55

M
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