Multiplying and dividing decimals Lesson Slides: 6 Slides

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1

Multiplying and dividing decimals

2

Multiplying decimals

work this out mentally

12 x 0.6 =

solution:

12 x 6 = 72

12 x 0.6 = 7.2

3

Dividing decimals

$\frac{36\ x\ 0.5\ }{0.2\ x\ 4.5}\ =$

Solution:
36 x 0.5 = 18
2 x 4.5 = 9
so 0.2 x 4.5 = 0.9

$\frac{36\ x\ 0.5}{0.2\ x\ 4.5}=\frac{18}{0.9}$

$\frac{18\ x\ 10}{0.9\ x\ 10}=\frac{180}{9}=\ 20\$

4

another example

$16\div0.6\$
solution:

$\frac{16\ \times10}{0.4\ \times10}=\frac{160}{4}$

$\frac{160}{4}=40$

5

another example

$8\ \div0.2$
solution:
$\frac{8\ \times100}{0.02\times100}=\ \frac{800}{2}$

$\frac{800}{2}=400$

6

Thank you

Multiplying and dividing decimals

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