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

To do:

We have to express the given numbers as cm using decimals.

Solution:

We know that,

$1\ cm=10\ mm$

This implies,

$1\ mm=\frac{1}{10}\ cm$

Therefore,

(a) $2\ mm=2\times\frac{1}{10}\ cm$

$=\frac{2\times1}{10}\ cm$

$=\frac{2}{10}\ cm$

$=0.2\ cm$

(b) $30\ mm=30\times\frac{1}{10}\ cm$

$=\frac{30\times1}{10}\ cm$

$=\frac{30}{10}\ cm$

$=3.0\ cm$

(c) $116\ mm=116\times\frac{1}{10}\ cm$

$=\frac{116\times1}{10}\ cm$

$=\frac{116}{10}\ cm$

$=11.6\ cm$

(d) $2\ mm=2\times\frac{1}{10}\ cm$

$=\frac{2\times1}{10}\ cm$

$=\frac{2}{10}\ cm$

$=0.2\ cm$

$4\ cm\ 2\ mm=(4+0.2)\ cm$

$=4.2\ cm$

(e) $162\ mm=162\times\frac{1}{10}\ cm$

$=\frac{162\times1}{10}\ cm$

$=\frac{162}{10}\ cm$

$=16.2\ cm$

(f) $83\ mm=83\times\frac{1}{10}\ cm$

$=\frac{83\times1}{10}\ cm$

$=\frac{83}{10}\ cm$

$=8.3\ cm$

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Updated on: 10-Oct-2022

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