• # question_answer 6) Express the following as cm using decimals. (a) 2 mm (b) 30 mm (c) 116 mm (d) 4 cm 2 mm (e) 162 mm (f) 83 mm TIPS As we know that, $+5\times \frac{1}{100}$ To convert mm into cm, we use tenths i.e. multiply given mm by 1/10 cm.

(a) We know that, $+50\times \frac{1}{100}$ $+7\times \frac{1}{100}$ $+75\times \frac{1}{100}$ (b) We know that, $10mm=1cm\Rightarrow 1mm=\frac{1}{10}cm$ $\therefore$ $4mm=4\times \frac{1}{4}cm=\frac{4}{10}cm=0.4cm$ (c) We know that, $10mm-1cm\Rightarrow 1mm=\frac{1}{10}cm$ $\therefore$ $7cm5mm=7cm+5mm$ $=7cm+5\times \frac{1}{10}cm$ $\left[ \because 1mm=\frac{1}{10}cm \right]$ (d) We know that, $=7cm+\frac{5}{10}cm=\left( 7+\frac{5}{10} \right)cm$ $=(7+0.5)cm=7.5cm$ $1000m\Rightarrow 1km$ $\Rightarrow$ $1m=\frac{1}{1000}km$ (e) We know that, $\therefore$ $52m=52\times \frac{1}{1000}km=\frac{52}{1000}km=0.052km$ $1m=\frac{1}{1000}km$ $\therefore$ (f) We know that,$340m=340\times \frac{1}{1000}km=\frac{340}{1000}km=0.340km$ $1m=\frac{1}{1000}km$$\therefore$ $2008m=2008\frac{1}{1000}km=\frac{2008}{1000}km=2.008km$