How_To_Be_Good_At_Math

CALCULATING • SHORT MULTIPLICATION 117

So, 736 × 4 = 2944

Next, we multiply 3 tens by 4 ones.

The answer is 12 tens. Add on the 2 tens

we carried over from the ones multiplication

to make 14 tens. Write the 4 in the tens column,

and carry the 1 to the hundreds column.

Now we multiply 7 hundreds by 4 ones.

The answer is 28 hundreds. Add on the

1 hundred we carried over from the tens

multiplication to make 29 hundreds. Write the

9 in the hundreds column and the 2 in the

thousands column.

Test your skills

Can you use short multiplication

to work out the answers to these

calculations? For the numbers

that have four digits, just add an

extra column to your answer

for the thousands.

TRY IT OUT

Answers on page 319

2739 × 3 =?

817 × 5 =?

295 × 8 =?

4176 × 4 =?

6943 × 9 =?

The 2 tens carried

over are added to

the number in

this column

The 1 hundred carried

over is added to the

number in this column

×

×

Th H T O

736

4

4 4

1

736

Th H T O

4

2944

736 × 4 = 2944

1 2

2 Multiply 3 tens

by 4 ones

Multiply

7 hundreds

by 4 ones

Once you understand

how to do short

multiplication, you can

use it for multiplying any

number with more than

one digit by a number

with just one digit.

116_117_Short_multiplication.indd 117 29/02/2016 14:11