2 + 2 = 4 - 

Double 2 is 4

8 = 4 + 4 - 

Double 4 is 8

3 + 3 = 6 - 

Double 3 is 6

10 = 5 + 5 - 

Double 5 is 10

$$ \frac{1}{2} $$ - 

is one of two equal parts.

$$ \frac{1}{3} $$ - 

is one of three equal parts.

$$ \frac{1}{4} $$ - 

is one of four equal parts.

A - 

$$ \frac{1}{4} $$

B - 

$$ \frac{1}{2} $$

C - 

$$ \frac{1}{3} $$

$$ \frac{1}{2} $$ of 6 = - 

3

$$ \frac{1}{2} $$ of 12 = - 

6

$$ \frac{1}{2} $$ of 16 = - 

8

$$ \frac{1}{2} $$ of 14 = - 

7

$$ \frac{1}{2} $$ of 8 = - 

4

Double 10 is - 

20

Double 6 is - 

12

Double 7 is - 

14

Double 8 is - 

16

Double 9 is - 

18

Double 3 is 6 - 

Half of 6 is 3

Double 6 is 12 - 

Half of 12 is 6

Double 5 is 10 - 

Half of 10 is 5

Double 10 is 20 - 

Half of 20 is 10