How do you evaluate .4 * .3?

Mar 4, 2017

$\frac{3}{25}$

Explanation:

Turn the two numbers into fractions and then multiply.

$0.4 = \frac{4}{10} = \frac{2}{5}$

$0.3 = \frac{3}{10}$

$\left(\frac{2}{5}\right) \cdot \left(\frac{3}{10}\right) = \frac{2 \cdot 3}{10 \cdot 5} = \frac{6}{50} = \frac{3}{25}$

Mar 4, 2017

A different approach

$0.12$

Explanation:

$0.4$ is the same as $4 \times \frac{1}{10}$

$0.3$ is the same as $3 \times \frac{1}{10}$

Putting all of this together gives.

$0.4 \times 0.3 \text{ "=" } 4 \times 3 \times \frac{1}{10} \times \frac{1}{10}$

$12 \times \frac{1}{100} = 0.12$

As the question is in decimal format the solution should also be in decimal format