Large Numbers Around Us — Important Questions
CBSE · Class 7 · Mathematics
37 important questions from Large Numbers Around Us for CBSE Class 7 Mathematics, with answers. Includes multiple choice and multiple correct questions.
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Important Questions from Large Numbers Around Us
Which of the following are correct ways to write 'fifty lakh'? (Select all correct answers)
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50,00,000, 5,000,000, 50 × 100000
50 lakh = 50,00,000 (Indian notation), 5,000,000 (American notation), or 50 × 100000 (multiplication form). 5,00,00,000 is 5 crore, and 500,000 is only 5 lakh.
If you count 1 number every second, how many minutes will it take to count to 1000?
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16 minutes 40 seconds
To count to 1000 at 1 number per second takes 1000 seconds. 1000 ÷ 60 = 16 remainder 40, so 16 minutes 40 seconds.
Calculate: 125 × 8
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1000
125 × 8 = 125 × (1000 ÷ 125) = 1000. Alternative: 125 × 8 = (100 + 25) × 8 = 800 + 200 = 1000.
Which operations give the same result as multiplying by 25? (Select all correct answers)
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Multiply by 100 and divide by 4, Divide by 4 and multiply by 100, Multiply by 50 and divide by 2, Multiply by 5 and multiply by 5
25 = 100/4 = 50/2 = 5×5. So all these operations are equivalent to ×25. However, ×20 + 5 is not the same (it would be 20x + 5, not 25x).
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
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