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Addition: Doubles

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Addition strategy: Doubles

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7 + 7 =

14

15

5 + 5 =

10

15

3 + 3 =

6

15

4 + 4 =

8

15

6 + 6 =

12

15

8 + 8 =

16

15

9 + 9 =

18

15

100 + 100 =

200

15

5 000 + 5 000 =

10 000

15

30 + 30 =

60

15

40 + 40 =

80

15

25 + 25 =

50

15

60 + 60 =

120

15

50 + 50 =

100

15

7 + 8 =

15

15

8 + 9 =

17

15

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