12+__=15
3
23-13=
10
42
9x100=
900
15+_=30
15
256-123=
133
45+23+10=
78
5x5=
25
123+___=246
123
456-156=
300
234+123
357
10x5=
50
3'567+____=4'567
1'000
9'000-5'000=
4'000
1'967+1'000
2'967
4x9=
36
4'___+1'___=5'000
000
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