Doubles
Doubles Plus 1
9s
Regrouping
!Surprise!
100

10+10

20

100

6+5

11

100

9+3

12

100

64+38

102

100

641+589

1,230

200

5+5

10

200

4+5

9

200

9+4

13

200

85+35

120

200

673+622

1,295

300

9+9

18

300

6+7

13

300

9+5

14

300

494+497

991

300

4,635+2001

6,636

400

7+7

17

400

2+3

5

400

9+6

15

400

813+137

950

400

1,845+4,701

6,546

500

12+12

24

500

9+8

17

500

9+9

18

500

9,151+7,977

17,128

500

9,999+9,999

19,998