Expressions using Letter-Numbers
CBSE · Class 7 · Mathematics
All formulas from Expressions using Letter-Numbers in CBSE Class 7 Mathematics. Key equations, constants, and identities for board exam preparation.
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Formulas
1. Letter-Numbers and Algebraic Expressions
Shabnam's age = Aftab's age + 3
Aftab's age = Shabnam's age - 3
2. Rules for Arithmetic and Algebraic Expressions
Swapping and grouping terms does not change the value of an expression
a(b + c) = ab + ac
Number before letter: 4n
3. Rectangle Perimeter in Letter-Numbers
p = l + b + l + b
p = 2l + 2b
4. Multiples of 4 and Omission of the Multiplication Sign
nth term = 4n
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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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