Question

Express $8\mathrm{mm}$ as cm using decimals.

Answer 1

$8\mathrm{mm}=\frac{8}{10}\mathrm{cm}[\because 1\mathrm{mm}=\frac{1}{10}\mathrm{cm}]$

Now, to convert a fraction having $10$ in the denominator into decimal , we put the decimal point one place left of the first digit in the numerator.

Therefore, $8\mathrm{mm}=0.8\mathrm{cm}$