Number Play
CBSE · Class 8 · Mathematics
All formulas from Number Play in CBSE Class 8 Mathematics. Key equations, constants, and identities for board exam preparation.
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Formulas
2. Parity of Expressions with + and -
(a + b - c - d) - (a - b - c - d) = 2b
odd ± odd = even
even ± even = even
odd ± even = odd
a ± b have the same parity
3. Even Numbers and Multiples of 4
4p + 4q = 4(p + q)
(4p + 2) + (4q + 2) = 4p + 4q + 4 = 4(p + q + 1)
4. Divisibility by 10, 3, and 9
General number place value expansion: ... + 1000d + 100c + 10b + a
General 5-digit number in Indian place value system: e × 10000 + d × 1000 + c × 100 + b × 10 + a
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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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