multiply
1x10=
what is 10
10+40=
what is 50
8-7=
what is 1
5x4=
what is 20
50+49=
what is 99
80-10=
what is 70
5x6=
what is 30
6+3=
what is 9
500-201=
what is 299
5x8=
what is 40
50+50=
what is 100
200-1=
what is 199
11x10=
what is 110
100+61=
what is 161
900-500=
what is 400