Numbers to 20
20-18
2
30+25
55
100-50
50
489+10
499
876 + 213
1089
4+12
16
50-38
12
36+56
92
534-222
312
1230-230
1000
30-11
19
15+18
33
89-57
32
350+150
500
652+237
889
7+8
15
49-36
13
32+81
103
125-42
83
985-673
312
18-6
12
15+15
30
97-58
39
159+364
523
4562+3121
7683