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NCERT Solutions Ganita Prakash (Part 1) Chapter 1 –5Reading and Writing Numbers — In-text Questions

Book page 4 Updated on2026-09-05

Q1.
How do you view a lakh — is a lakh big or small?
Answer

Both — it depends on what you are counting. A lakh is big for slow things and small for crowded things.

A lakh feels BIG when…A lakh feels SMALL when…
1 lakh days = 274 years of living1 lakh people fit in the Ahmedabad cricket stadium
1 lakh people in a line stretch 38 km80,000–1,20,000 hairs sit on one head
1 lakh varieties of rice is a huge treasure of seedsOne female fish can lay nearly a lakh eggs at a time
Why it happens: A number by itself has no size — size comes from comparison. 1 lakh seconds is barely more than a day, but 1 lakh days is nearly three centuries. So always ask “a lakh of what?” before deciding whether it is big.
Try This: Chintamani's population is about 1 lakh. Could the whole town sit inside the Ahmedabad stadium? Yes — the stadium seats more than 1 lakh people.
Q2.
Write each of the numbers given below in words: (a) 3,00,600 (b) 5,04,085 (c) 27,30,000 (d) 70,53,138
Answer

Read the groups from the left: crore, lakh, thousand, then the last three digits.

NumberNumber name (Indian system)
(a) 3,00,600Three lakh six hundred
(b) 5,04,085Five lakh four thousand eighty five
(c) 27,30,000Twenty seven lakh thirty thousand
(d) 70,53,138Seventy lakh fifty three thousand one hundred thirty eight
Why it happens: In 3,00,600 the “00” in the thousands group means no thousands at all, so that group is simply skipped while reading — you do not say “zero thousand”. The same happens with the lakh group of 27,30,000, where the last three digits are 000 and nothing more is read.
Tip: Never insert “and” inside an Indian number name. 5,04,085 is “five lakh four thousand eighty five”, not “five lakh and four thousand…”.
Q3.
Write the corresponding number in the Indian place value system for each of the following: (a) One lakh twenty three thousand four hundred and fifty six (b) Four lakh seven thousand seven hundred and four (c) Fifty lakhs five thousand and fifty (d) Ten lakhs two hundred and thirty five
Answer

Write each group in its own place, and fill any missing group with zeroes.

Number nameNumber
(a) One lakh twenty three thousand four hundred and fifty six1,23,456
(b) Four lakh seven thousand seven hundred and four4,07,704
(c) Fifty lakhs five thousand and fifty50,05,050
(d) Ten lakhs two hundred and thirty five10,00,235
(d) Ten lakhs = 10,00,000
two hundred thirty five = 235
10,00,000 + 235 = 10,00,235
Why it happens: The zeroes are the whole trick. “Ten lakhs two hundred thirty five” has no thousands, so a 0 must be written in the thousands place — otherwise 10,00,235 would shrink to 10,235.
Check it yourself: Count the digits. Every number between one lakh and ten lakh has 6 digits; every number between ten lakh and one crore has 7 digits. (c) 50,05,050 has 7 digits — correct for fifty lakh.
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