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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