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Inter-Conversion of Fractions and Decimals

d Express the...

Question

Question 6 (d)

Express the following as cm using decimals:
4 cm 2 mm

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Solution

We know that $10 m m = 1 c m$
$∴ 1 m m = \frac{1}{10} c m$
$4 c m 2 m m = 4 c m + \frac{2}{10} c m$
$= 4 c m + 0.2 c m = 4.2 c m$

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Express the following as cm using decimals:

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