Ex 2.5 Q2 Fractions and Decimals - NCERT Maths class 7

Question

Express as rupees using decimals:

i) $$7$$ rupees $$7$$ paise

ii) $$7$$ rupees $$7$$ paise

iii) $$7$$ rupees $$7$$ paise

iv) $$7$$ rupees $$7$$ paise

v) $$7$$ rupees $$7$$ paise

Video Solution
Fractions And Decimals
Ex 2.5 | Question 2

Text Solution

What is known?

Amount in paise.

What is unknown?

Amount in rupees.

Reasoning:

$$1$$ paise $$=$$ \begin{align}\frac{1}{{100}}\end{align}rupees

Steps:

i) $$7$$ paise

$$100$$ paise $$=$$ $$1$$ rupees

$$1$$ paise $$=$$ \begin{align}\frac{1}{{100}}\end{align} rupees

$$7$$ paise $$=$$ $$7$$ $$×$$\begin{align}\frac{1}{{100}}\end{align}rupees $$= 0.07$$ rupees

ii) $$7$$ rupees $$7$$ paise

$$100$$ paise $$=$$ $$1$$ rupees

$$1$$ paise $$=$$ \begin{align}\frac{1}{{100}}\end{align}rupees

$$7$$ rupees $$7$$ paise $$=$$  $$7$$ rupees $$+$$ $$7$$ paise

$$=$$ $$7$$ rupees $$+$$ $$7$$ $$×$$\begin{align}\frac{1}{{100}}\end{align}rupees

$$=$$ $$7$$ rupees $$+$$ $$0.07$$ rupees

$$=$$ $$7.07$$ rupees

iii) $$77$$ rupees $$77$$ paise

$$77$$ rupees $$77$$ paise $$=$$  $$77$$ rupees $$+$$ $$77$$ paise

$$=$$ $$77$$ rupees + $$77$$ $$×$$ \begin{align}\frac{1}{{100}}\end{align}rupees

$$\because$$$$100$$ paise $$=$$ $$1$$ rupees)

($$\therefore$$ $$1$$ paise $$=$$ \begin{align}\frac{1}{{100}}\end{align}rupees)

$$=$$ $$77$$ rupees $$+$$ $$0.77$$ rupees

$$=$$ $$77.77$$ rupees

iv) $$50$$ paise

$$\therefore$$ $$100$$ paise $$=$$ $$1$$ rupees

$$\therefore$$ $$1$$ paise $$=$$ \begin{align}\frac{1}{{100}}\end{align} rupees

$$50$$ paise $$=$$ $$50$$ $$×$$\begin{align}\frac{1}{{100}}\end{align}rupees

=> $$50$$ paise $$=$$ \begin{align}\frac{{50}}{{100}}\end{align}rupees

$$50$$ paise $$=$$ $$0.50$$ rupees

v) $$235$$ paise

$$\therefore$$ $$100$$ paise $$=$$ $$1$$ rupees

$$\therefore$$ $$1$$ paise $$=$$ \begin{align}\frac{1}{{100}}\end{align} rupees

$$235$$ paise $$=$$ $$235$$ $$×$$ \begin{align}\frac{1}{{100}}\end{align} rupees

$$235$$ paise $$=$$ \begin{align}\frac{{235}}{{100}}\end{align}rupees

$$235$$paise $$=$$ $$2.35$$ rupees

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