addition
subtraction
add and subtract
mental math
random
100

5+7

12

100

1-1

0

100

6+3-5

4

100

8+5

13

100

5-4

1

200

3+20

23

200

10-5

5

200

8+3-2

9

200

20+6

26

200

9+9

18

300

12+6

18

300

13-5

8

300

20+6-6

20

300

12+4

16

300

13+4+6

23

400

15+6

21

400

18-16

2

400

19+1-7

13

400

7+7

14

400

22-5-3

14

500

32+8

40

500

37-22

15

500

11+11-14

8

500

14+5

19

500

36-4+2

34

M
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