Doubles and Halves

How do we double a number?

• Dividing by 2

• Multiplying by 2

• Subtracting by 2

• All of the above

What is Double 50?

• 25

• 100

• 150

• 10

Can you find half of 24?

• 12

• Half of 20 is 10 and half of 4 is 2- so the answer is 12

• 28

• 48

• No

What is double 25?

• 25 + 20 = 45

• 20 + 5 = 25

• 25 + 25 = 50

....... is half of 56

• 30

• 32

• 28

14 doubled

• 38

• 18

• 28

• 34

Half of 30

• 15

• 10

• 12

• 18

To halve a number we have to divide the number by

• 2

• 4

• 6

• 8

The double of 310 is

• 420

• 620

• 610

• 155

The half of 1000 is

• 100

• 500

• 10

• 2000