Doubles
Doubles Plus One
Before
After
Counting
9

Solve the math problem:

4+4= ___

8

9

Solve the math problem:

2+3=

5
9

Number before 8

7

9

Number after 3

4

9

X X X X

X X X 

7

18

Solve the math problem:

2+2=

4

18

Solve the math problem:

1+2=

3

18

Number before 10

9

18

Number after 11

12

18

X X X X X

X X X X X

10

27

Solve the math problem:

3+3=

6

27

Solve the math problem:

4+5=

9
27

Number before 15

14

27

Number after 17

18

27

X X X X X

X X X X X

X X X

13

36

Solve the math problem:

0+0=

0

36

Solve the math problem:

3+4=

7
36
Number before 20

19

36

Number after 19

20

36

X X X X X

X X X X X

X X X X X

X X X 

18

90

Solve the math problem:

5+5= ___

10
90

Solve the math problem:

5+6=

11

90

Number before 5

4

90

Number after 6

7

90

X X X X X

5

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