Imp Questions For All Chapters – Ganit Prakash Class 7th
Large Numbers Around Us
1. What is the smallest 6-digit number?
Answer: 1,00,000 (One lakh)
2. How many varieties of rice were there in the past, as per the chapter?
Answer: About one lakh varieties.
3. If a person eats 2 varieties of rice a day, how many varieties will they eat in 100 years?
Answer: 2 × 365 × 100 = 73,000 varieties (less than 1 lakh)
4. How much less is 75,000 than 1 lakh?
Answer: 1,00,000 − 75,000 = 25,000
5. How do we write 12,78,830 in words?
Answer: Twelve lakh seventy-eight thousand eight hundred thirty.
6. What is the value of: One lakh twenty-three thousand four hundred fifty-six?
Answer: 1,23,456
7. How many zeroes are there in 1 crore?
Answer: 7 zeroes → 1,00,00,000
8. What is 1 billion called in the Indian system?
Answer: 1 arab or 100 crore
9. How many thousands are there in 1 lakh?
Answer: 1000 × 100 = 1,00,000 → So, 1000s in 1 lakh = 100
10. Estimate: 4,63,128 + 4,19,682 is near which lakh?
Answer: It is near 8,83,000. Closer estimate: less than 9,00,000
11. Is 1 lakh a big number or small?
Answer: It depends. For example, 1 lakh people can fill a stadium, but also 1 lakh hairs can fit on a person’s head. So, context matters.
12. What is the shortcut to multiply 824 × 25?
Answer: 824 × 25 = (824 × 100) ÷ 4 = 82,400 ÷ 4 = 20,600
13. Write 70,53,138 in words.
Answer: Seventy lakh fifty-three thousand one hundred thirty-eight.
14. What is 125 × 40 × 8 × 25?
Answer: 125 × 8 = 1000, so: 1000 × 40 × 25 = 10,00,000
15. What is the distance from Earth to the Sun (approx.)?
Answer: 2100 × 70,000 = 1,47,00,000 km (147 million km approx.)
16. How many coins, 1 mm thick, are needed to match the Statue of Unity (180 m)?
Answer: 180 m = 180,000 mm → So, 180,000 coins needed.
17. What is the meaning of ‘rounding up’?
Answer: Approximating a number to a higher value. E.g., 732 sweets rounded up to 750.
18. What is the approximate population increase of Pune from 2001 to 2011?
Answer: 31,15,431 − 25,38,473 ≈ 5,76,958
19. How many years will it take to travel 3,84,400 km (Earth to Moon) at 100 km/day?
Answer: 3,84,400 ÷ 100 = 3,844 days ≈ 10.5 years
20. How many babies are born worldwide in a day if 250 are born every minute?
Answer: 250 × 60 × 24 = 3,60,000 babies per day
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