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Q.

How do you convert $\frac{3}{8}$ into a decimal?

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a

7.35

b

0.375

c

3.75

d

0.75

answer is B.

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Detailed Solution

We can convert the fraction by multiplying the numerator and denominator by

5 \times 5 \times 5

.
Given,

\frac{3}{8} = \frac{3 \times 5 \times 5 \times 5}{8 \times 5 \times 5 \times 5} = \frac{375}{1000}

Or

0.375

∴ It is only possible when prime factors of denominator are

2' s

and

5' s

just multiplying as many

5' s

and

2' s

.

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