addition
23+45
what is 68
34-28
what is 6
4 after 19
what is 23
8 before 6
what is 2
267
what is 200+60+7
45+37
what is 82
67-28
what is 39
8 after 9
what is 17
17 before 12
what is 5
578
what is 500+70+8
37+37
what is 74
52-28
what is 24
12 after 9
what is 23
8 before 3
what is 5
458
what is 400+50+8
64+23
what is 87
76-48
what is 28
8 after 13
what is 21
7 before 1
what is 6
673
what is 600+70+3
59+39
what is 98
89-76
what is 13
9 after 7
what is 18
8 before 2
what is 6
987
what is 900+80+7