How_To_Be_Good_At_Math

201

Hamsters

80p each

MEASUREMENT • CALCULATING WITH MONEY

Line up the

decimal points

MEASUREMENT • CALCULATING WITH MONEY

Look at these animals. Let’s work out how

much change we would get if we paid for

three hamsters and one rabbit with a £10 note.

First, we need to find the total cost of the

animals in pounds. We know 80p is the same

as £0.80, so: (0.80 × 3) + 2.70 = 2.40 + 2.70 = 5.10.

The animals cost £5.10 in total.

Now we can work out the change from £10.

First, add on pence to take us to the nearest

pound. Adding 90p to £5.10 takes us to £6.

Next, we add on pounds to take us up

to £10. Adding £4 takes the total to £10.

Now, we add these two amounts together:

£4 + 90p = £4.90

Calculate the cost

Can you work out the total cost

in pounds of all these items?

Remember to convert the amounts

so they are all in the same unit.

TRY IT OUT

Answer on page 319

Giving change

When we’re paying for things, it’s useful to be able to work out

how much change we’re owed. All we need to do is find the

difference between the price of the items and the amount we

paid. We do this by counting up. If the amounts aren’t all in

the same unit, we’ll need to start by doing a conversion.

Rabbits

£2.70 each

50p each £1.70 each 80p each

So, the change we get from buying

the animals with a £10 note is £4.90.

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