A
20+20+20+20= =
80
80+40 =
120
1000+500 =
1500
500+250 =
750
5+5+5+5 =
20
40-10=
30
300-100=
200
800-500=
300
50-8
42
84-12=
72
7x6 =
42
4x7 =
28
3x7 =
21
5x7 =
35
9x7=
63
5x8 + 4 =
44
5x6 - 3 =
27
5x9 +2 =
47
3x5 + 10 =
25
2x5-9 =
1