Question

Express $18cm8mm$ as centimetres using decimals.

Answer 1

Converting the given length into centimetres using decimals:

$10mm=1cm$

$\therefore 1mm=\frac{1}{10}cm$ (By unitary method)

$\Rightarrow$ $8mm=8\times \frac{1}{10}=\frac{8}{10}=0.8cm$

$\Rightarrow$ $18cm=18.0cm$

$18cm8mm=18cm+8mm$

$18.0+0.818.8$ (Adding like decimals)

Hence, $18cm8mm=18.8cm$.