Large Numbers Around Us
CBSE · Class 7 · Mathematics
All formulas from Large Numbers Around Us in CBSE Class 7 Mathematics. Key equations, constants, and identities for board exam preparation.
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Formulas
1. Large Numbers: Lakh, Crore, Arab
1 lakh = 100 × 1 thousand
1 crore = 100 × 1 lakh
1 arab = 100 × 1 crore
1 lakh = 1,00,000
1 crore = 1,00,00,000
2. Reading and Writing Large Numbers
Indian grouping: last 3 digits, then groups of 2 digits
International grouping: groups of 3 digits throughout
3. Approximation, Rounding, and Nearest Neighbours
rounding up = approximated number > actual number
rounding down = approximated number < actual number
4. Comparing Large Quantities with Familiar Objects
Approximate building height = 4 × Somu's height per floor × number of floors
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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
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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