Doubles

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Doubles 1

Doubles 2

Using Doubles to Subtract

Near Doubles 1

Near Doubles 2

100

1+1 =

2

100

2+2 =

4

100

I know 2+2=4,

so 4-2=___

2

100

1+1=2,

so 1+2=

3

100

2+2=4,

so 2+3=

5

200

4+4=

8

200

3+3=

6

200

I know 3+3=6,

so 6-3=___

3

200

3+3=6,

so 3+4=

7

200

4+4=8,

so 4+5=

9

300

5+5=

10

300

6+6=

12

300

I know 5+5=10,

so 10-5=___

5

300

6+6=12,

so 6+7=

13

300

5+5=10,

so 5+6=

11

400

8+8=

16

400

7+7=

14

400

I know 7+7=14,

so 14-7=___

7

400

8+8=16,

so 8+9=

17

400

7+7=14,

so 7+8=

15

500

10+10=

20

500

9+9=

18

500

I know 9+9=18,

so 18-9=___

9

500

9+9=18,

so 9+10=

19

500

10+10=20,

so 10+11=

21