How_To_Be_Good_At_Math

CALCULATING • EXPANDED SHORT MULTIPLICATION 115

As you multiply numbers

with more digits, you'll

need to add extra rows

to your answer.

Finally, we just need to add together our

three answers to get the final answer:

24 + 160 + 3200 = 3384

So, 423 × 8 = 3384

Next, we multiply the 2 tens by 8 ones.

The answer is 16 tens. This is the same as

160, so we write 160 on the row beneath 24.

Now we multiply the 4 hundreds by

8 ones. The answer is 32 hundreds.

This is the same as 3200, so we write

3200 on the line below 160.

423

8

Multiply the

tens digit by 8

H T O

×

Th

24

160

423

8

Multiply the

hundreds digit by 8

H T O

×

Th

24

160

3200

423

8

H T O

×

Th

24

160

3200

3384

Stretch yourself

If a single spider has 8 legs, how

many legs do 384 spiders have?

TRY IT OUT

Answer on page 319

All we need to do is multiply

each digit of 384 by 8 then

add the answers together.

We can use expanded short

multiplication to work out

the answer. We simply need to

multiply 8 by 384.

Add the three

lines in the

answer together

423 × 8 = 3384

114_115_Expanded_short_multiplication.indd 115 29/02/2016 14:11