How_To_Be_Good_At_Math

CALCULATING • DIVIDING BY MULTIPLES OF 10 137

Dividing by multiples

of 10

If your divisor (the number you’re dividing by) is a multiple of 10,

you can split the calculation into two easier steps. For example,

instead of dividing by 50, you divide first by 10 and then by 5.

Stage

one

Stage

two

Since 30 is a multiple of 10, we can split

the division. Dividing in stages by 10 and

3 is easier than dividing by 30 all at once.

This calculation asks how many times 30

fits into 6900. Although we’re dividing a

big number, it’s not as difficult as it looks.

First, we divide 6900 by 10. See page

136 (opposite) if you need help with this.

The answer is 690.

Next, we divide 690 by 3.

The answer is 230.

So, 6900 ÷ 30 = 230

6900 ÷ 10 ÷ 3

6900 ÷ 30 =?

6900 ÷ 30 = 230

Mind-boggling multiples

The divisors in these questions

are multiples of 10. Split up the

multiples, then find the answers.

TRY IT OUT

Answers on page 319

To split up a multiple

of 10 for this kind of

division, break the

multiple into 10 and its

other factor.

A class of 20 children has to deliver 860 leaflets

to advertise the school craft fair. If they share the

work equally, how many leaflets should each child take?

The children also make some bead bracelets to

sell at the fair. Each bracelet contains 40 beads.

How many bracelets do they make with 1800 beads?

6900 ÷ 10 = 690

690 ÷ 3 = 230

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