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KeyStage 2 Lower

Subtract multiples of 10's from two digit numbers

Lesson

This chapter looks at how to subtract a multiple of $$10 from a two digit number.

What does a multiple of $$10 look like?

Well if you have more than one $$10 grouped together, you have a multiple of ten. $$2 tens added together are $$20, so $$20 is a multiple of $$10.

If I have $$5 tens I had $$10+10+10+10+10 to get $$50, $$50 is also a multiple of ten.

How do we subtract multiples of ten from a $$2 digit numbers.

Well we have to consider the place values, the tens and the ones (or units).

There are $$2 ways we could subtract the multiple of ten from the two digit number. We could take each ten away one at a time, so $$3220 is the same as $$321010.

My first step is $$3210 which is $$22, then my next step is $$2210 which is $$12. So $$3220=12.

The second way we can subtract multiples of ten is to align our 2 numbers in place values. We then subtract the ones, and then the tens. Here is what 46 - 30 looks like.

Watch the video below to see how we can do these 2 ways.

  Tens Units
  $$4 $$6
- $$3 $$0
= $$1 $$6

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Worked Examples


EXAMPLE 1


Find the value of $$9010?

EXAMPLE 2

Create a pattern by subtracting $$10 each time.

  1. $$90, $$, $$, $$, $$, $$

EXAMPLE 3

Complete the number sentence below to make it true.

  1. $$48=18

 

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