NCERT Solutions Ganita Prakash (Part 1) Chapter 3 In-text Questions — Units of Measurement

Book page 69 Updated on2026-09-05

Q1.

Fill in the blanks below (rupee <–> paise): 10 p = ___________; _______p = ₹ 0.05; ________p = ₹ 0.36; _________ = ₹ 0.50; 99 p = _________; 250 p = _________

Answer

Given	Working	Answer
10 p	¹⁰⁄₁₀₀ rupee	₹0.10
? = ₹0.05	0.05 × 100	5 p
? = ₹0.36	0.36 × 100	36 p
? = ₹0.50	0.50 × 100	50 p
99 p	⁹⁹⁄₁₀₀ rupee	₹0.99
250 p	²⁵⁰⁄₁₀₀ rupee = 2 rupees + ⁵⁰⁄₁₀₀	₹2.50

Why it happens: 1 rupee = 100 paise, so 1 paisa = ¹⁄₁₀₀ rupee = ₹0.01. The paise are simply the two digits after the decimal point — which is why every price tag has exactly two decimal places.

Tip: 75 paise = ⁷⁵⁄₁₀₀ = ⁷⁄₁₀ + ⁵⁄₁₀₀ = ₹0.75 — 7 ten-paise coins and 5 single paise.

Q2.

Discuss with adults at home/school the prices of different products and services during their childhood. Try to find old coins and stamps.

Answer

This is a project to do at home. Note down each price in rupees and in paise, then compare with today's price.

Item	Price in the 1970s	In rupees	Roughly today
Masala dosa	50 paise	₹0.50	₹50 – ₹80
One banana	20 – 25 paise	₹0.20 – ₹0.25	₹5 – ₹10
A handful of peppermints	2 – 3 paise	₹0.02 – ₹0.03	₹5
1 kg rice	₹2.45	₹2.45	₹50 – ₹70

Why it happens: all coins of 25 paise and below were withdrawn in 2011 because they could no longer buy anything. Paise survive today only inside written amounts — bills, bank statements and petrol prices.

Try This: ask an elder what their first salary was and write it in rupees and paise. Then work out how many masala dosas it could have bought in the 1970s, and how many it would buy today.

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