Addition
5+5
10
15-4
9+9
18
28-9
19
Skip count by 2s till 8.
2, 4, 6, 8
20+30
50
27-3
24
16+17
33
45-13
32
Skip count by 3s till 15
3, 6, 9, 12, 15
400+500
900
39-7
32
45+10
55
321-123
198
Skip count by 4s till 16.
4, 8, 12, 16
1000+6000
7000
50-5
45
89+3
92
17-8
9
Skip count count by 6s to 18
6, 12, 18
72+24
96
65-1
64
3735+112
3847
9-9
0
Skip count by 9s till 72
9, 18, 27, 36, 45, 54, 63, 72