Ex.8.2 Q2 Compairing Quantities - NCERT Maths Class 7

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Question

Convert the given decimal fractions to per cents.

a) \(0.065\)

(b) \(2.1\)

(c) \(0.02\)

(d) \(12.35\)

Text Solution

What is Known?

Numbers in the decimal form.

What is Unknown?

Per cent form of the given numbers.

Reasoning:

First convert the decimal form into fractions and after that multiply the fraction with \(100\) to convert it into percentage.

Steps:

(a) \[\begin{align}&0.65 = \frac{{65}}{{100}}\\ &\frac{{65}}{{100}} \times 100 = 65\%\end{align}\]

(b) \[\begin{align}&2.1 = \frac{{21}}{{10}}\\ &\frac{{21}}{{10}} \times 100 = 210\%\end{align}\]

(c) \[\begin{align}&0.02 = \frac{2}{{100}}\\ &\frac{2}{{100}} \times 100 = 2\%\end{align}\]

(d) \[\begin{align}&12.35 = \frac{{1235}}{{100}}\\ &\frac{{1235}}{{100}} \times 100 = 1235 \%\end{align}\]