Know Your Subtraction: Subtract Numbers Between 0 and 20

Subtraction is taking something away.

It is the opposite of addition. (Addition is adding something on.)

 

 

Look at this example.

 

Take 4 away from 20 equals

16

 

We can write it like this, too.

20 - 4 = 16

 

We take 4 away from 20 to get 16. That's subtraction!

 

 

Now try for yourself.

 

Pop your finger on 20 on the number line. Bounce it back (to the left) 4 places. What number did you get to? It should have been 16 because we know that

20 - 4 = 16

 

 

 

Always count to the left on a number line when you are subtracting.

 

 

Are you ready to have a go at some questions?