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# Express the following as cm using decimals.$4 cm$ $2 mm$

Last updated date: 31st Mar 2023
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Hint: In this question we have to convert $4cm$ $2mm$ in $cm$, so the key concept is to express the $2mm$ in $cm$ only by using the conversion rule of length and then by adding this part to $4cm$ part we get the right answer.

We have been given that $4cm2mm$.
Now convert the $2mm$ into $cm$.
We know that $1cm = 10mm$
Or, $1mm = \dfrac{1}{{10}}cm$
Or, $1mm = 0.1cm$
So, $2mm = 2 \times 0.1cm$
Or, $2mm = 0.2cm$
Hence we can write $4cm 2 mm = 4cm + 0.2cm = 4.2cm$.