Making 10
Doubling
Doubles +1
Skip counting by 3
Place Value

Expanded Form
100

2+___

8

100

2+2

4

100

2+3

5

100

3,6,___

9

100

56

50+5

200

5+___

5

200

4+4

8

200

4+5

9

200

9,12,___

15

200

89

80+9

300

9+___

1

300

6+6

12

300

5+6

11

300

12,15,____

18

300

142

100+40+2

400

6+____

4

400

7+7

14

400

7+8

15

400

18,21,____

24

400

809

800+9

500

7+____

3

500

9+9

18

500

8+9

17

500

24,27,_____

30

500

1642

1000+600+40+2

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