Number Play
CBSE · Class 7 · Mathematics
All formulas from Number Play in CBSE Class 7 Mathematics. Key equations, constants, and identities for board exam preparation.
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Formulas
2. Parity: Even and Odd
nth even number: 2n [n = position number in the sequence]
nth odd number: 2n - 1 [n = position number in the sequence]
3. Grid Sums and Magic Squares
Row-sum total identity for 1-9 grid: sum of all row sums = sum of numbers 1 to 9 = 45 [used to derive magic sum = 45/3 = 15]
4. Virahānka-Fibonacci Numbers
Virahānka-Fibonacci recurrence: next term = sum of the two previous terms [applies to sequence 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, ...]
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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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