Show:
Counting by 2
Counting by 5
Addition
Subtraction
What's the rule?
100

2, 4, 6, ___

8

100

5, 10, ____

15

100

2+3=

5

100

5-3=

2

100

2, 4, 6, 8, 10

Count by 2s or +2

200

22, 24, 26, 28, ____

30

200

25, 30, ___

35

200

3+7=

10

200

10-5=

5

200

5, 10, 15, 20

Count by 5s or +5

300

50, ____

52

300

50, ____

55

300

10+ 5=

15

300

10-8=

2

300

1, 3, 5, 7, 9

+2

400

78, ____

80

400

75, ____

80

400

8+3=

11

400

20-10=

10

400

50, 40, 30, 20

-10

500

236, _____

238

500

200, ____

205

500

11+ 5=

16

500

50-20=

30

500

80, 60, 40, 20

-20