subtraction problem (for kindergarden)
Adding problem (for kindergarden)
100

2-2 

0

100

6+2

8

200

12-2

10

200

10+10

20

300

100-10

90

300

65+5

70

400

24-12

12

400

100+ 100

200

500

100-50

50

500

1000+500

1500

M
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