10+10=
20
100-28
72
5x5
25
8/2
4
20+20=
40
300-122
178
9x9
81
81/9
9
40+40=
80
900-300
600
100x100
1000
25/5
5
50+50=
100
500-127
373
400x200
800
1000/100
10000+60
10060
800-572
228
900x900
1800
10000/1000