In this worksheet you have to answer mixed questions all about subtraction.

Subtracting is all about taking numbers away.

__Example 1__

Work out:

21 - 7

__Answer__

You should know that 11 - 7 = 4, so

21 - 7 =** 14**

__Example 2__

What is the missing number?

___ - 12 = 29

**Answer**

Here we use the opposite of subtraction, which is addition, to work out the starting number of the given subtraction.

We must work out 12 + 29

Add the units 2 + 9 = 11

Add the tens 10 + 20 = 30

Add the two results 11 + 30 = 41

12 + 29 = **41**

**41** - 12 = 29

__Example 3__

Work out:

43 - 29

__Answer__

Here we subtract 30 instead of 29.

Then we add 1 back at the end.

This is because we subtracted 1 too many by subtracting 30 instead of 29.

43 - 30 = 13

13 + 1 = 14

43 - 29 =** 14**