By 10's
By 9's
By 12's
By 8's
By 15's
100
20
What is 10+10?
100
18
What is 9+9?
100
24
What is 12+12?
100
16
What is 8+8?
100
15
What is 0+15?
200
50
What is 40+10?
200
27
What is 18+9?
200
36
What is 24+12?
200
32
What is 24+8?
200
30
What is 15+15?
300
80
What is 70+10?
300
36
What is 27+9?
300
40
What is 32+8?
300
45
What is 30+15?
400
110
What is 100+10?
400
54
What is 45+9?
400
96
What is 84+12?
400
56
What is 48+8?
400
65
What is 50+15?
500
220
What is 210+10?
500
81
What is 72+9?
500
108
What is 96+12?
500
64
What is 56+8?
500
75
What is 60+15?
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