Let's say we want to do: 9 - 5 - 3

This can mean two things: Either (9 - 5) - 3 or 9 - (5 - 3). The answers to them are different. Remember that we must do what is written in the parenthesis first.

In the first statement:

(9 - 5) - 3

9 - 5 = 4

4 - 3 = 1

(9 - 5) - 3 = 1

In the second statement:

9 - (5 - 3)

5 - 3 = 2

9 - 2 = 7

9 - (5 - 3) = 7

*Very different answers.*Remember that subtraction is not commutative so the rule, generally, is to do what is in the parenthesis first. Do the inner parentheses first and work your way outward.

((9 - 2) - 3) - (2 - 1)

(7 - 3) - (2 - 1)

4 - 1

3

((9 - 2) - 3) - (2 - 1) = 3

# Subtracting numbers with more than one digit

Let's say we want to do 95 - 33.

95 - 33 = ?

We do it in the same way as addition but using subtraction instead of addition.

9 - 3 = 6

5 - 3 = 2

**95 - 33 = 62**

78 - 54

7 - 5 = 2

8 - 4 = 4

**78 - 54 = 24**

And now let's move on to the more fun lesson in subtraction - borrowing tens.

## Error