Counting on by 10's
Counting on by 20's
Doubles
Counting back by 10's
Counting back by 20's
100

10+10=

20

100

10+20=

30

100

4+4=

8

100

10-10=

0

100

30-20=

10

200

25+10=

35

200

20+20=

40

200

8+8=

16

200

40-10=

30

200

70-20=

50

300

52+10=

62

300

41+20=

61

300

9+9=

18

300

84-10=

74

300

89-20=

69

400

12+10=

22

400

77+20=

97

400

30+30=

60

400

36-10=

26

400

48-20=

28

500

96+10

106

500

96+20=

116

500

60+60=

120

500

104-10=

94

500

105-20=

85