Question

Evalutate : $\left(0.3\right)\times \left(0.3\right)-\left(0.2\right)\times \left(0.2\right)$

Answer 1

Given$\left(0.3\right)\times \left(0.3\right)-\left(0.2\right)\times \left(0.2\right)\because 0.3=\frac{3}{10}and0.2=\frac{2}{10}$
[1 mark]

$\therefore (\frac{3}{10}\times \frac{3}{10})-(\frac{2}{10}\times \frac{2}{10})=\frac{9}{100}-\frac{4}{100}$
[1 mark]

$=\frac{9-4}{100}=\frac{5}{100}$
[0.5 marks]

$=0.05$
[0.5 marks]