By 10's

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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