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Writing Rational Numbers as Decimals

Express 345...

Question

Express $3 \frac{4}{5}$ in the decimal representation

A

3.8

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B

6.8

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C

3.4

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D

6.4

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Solution

The correct option is C $3.8$
$3 \frac{4}{5} = \frac{3 \times 5 + 4}{5}$
$= \frac{19}{5} \times \frac{2}{2}$
$= \frac{38}{10}$
$= 3.8$

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