Doubles to 10
Doubles to 20
Doubles to 10 +1
Doubles to 20 +1
Add 10
100

double 1

2

100

double 6

12

100

1+2

3

100

6+7

13

100

3+10

13

200

double 2

4

200

double 7

14

200

2+3

5

200

7+8

15

200

7+10

17

300

double

3

300

double 8

16

300

3+4

7

300

8+9

17

300

20+10

30

400

double 4

8

400
double 9

18

400

4+5

9

400

9+10

19

400

44+10

54

500

double 5

10

500

double 10

20

500

5+6

11

500

10+11

21

500

79+10

89