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How to Divide by 100

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When you need to divide a number by $100$ , there’s a great trick you can use!

Rule

When you divide a number by $100$ , you move the point in the number two places to the left.

There are three special cases you’ll come across:

1.: If the number is not a decimal number, remember that there is always an invisible point behind the last digit. Then you can move that point two places to the left.
2.: If the number ends in a $0$ , moving the point past that makes the $0$ disappear.
3.: If you have to move the point past all the digits of the number, you get empty places at the start of the number that you fill up with $0$ .

You’ll use the rule in the box below a lot moving forward. Make sure you understand what it says. Below the box there will be some examples.

Rule

Dividing by

100

is the same as multiplying by

0.01

1 \div 100 = \frac{1}{100} = 0.01

The trick of moving the decimal point when dividing by 100, is similar to a trick you can use when multiplying by 100.

Example 1

Dividing by 100

a)
$61 \div 100 = 0.61$

b)
$763.4 \div 100 = 7.634$

c)
$20 \div 100 = 0.20 = 0.2$

d)
$0.4 \div 100 = 0.004$

Example 2

Multiplying by $0.01$

a)
$\begin{array}{l} 61 \cdot 0.01 & = 61 \div 100 \\ = 0.61 \end{array}$

$61 \cdot 0.01 = 61 \div 100 = 0.61$

b)
$\begin{array}{l} 763.4 \cdot 0.01 & = 763.4 \div 100 \\ = 7.634 \end{array}$

$763.4 \cdot 0.01 = 763.4 \div 100 = 7.634$

c)
$\begin{array}{l} 20 \cdot 0.01 & = 20 \div 100 \\ = 0.20 = 0.2 \end{array}$

$20 \cdot 0.01 = 20 \div 100 = 0.20 = 0.2$

d)
$\begin{array}{l} 0.4 \cdot 0.01 & = 0.4 \div 100 \\ = 0.004 \end{array}$

$0.4 \cdot 0.01 = 0.4 \div 100 = 0.004$

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How to Divide by 10

How to Divide by 1000

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Dividing by 100

Multiplying by 0.01

Multiplying by $0.01$