Expressions using Letter-Numbers
CBSE · Class 7 · Mathematics
Quick revision notes for Expressions using Letter-Numbers — CBSE Class 7 Mathematics. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
4.1 The Notion of Letter-Numbers
- Letter-numbers (variables) are symbols used to represent unknown or variable quantities
- Common letters used: a, b, c, x, y, z, etc.
- Algebraic expressions contain letter-numbers and numbers combined using mathematical operations
4.2 Revisiting Arithmetic Expressions
- Order of operations (BODMAS/PEMDAS) applies to algebraic expressions too
- Brackets first, then multiplication/division, then addition/subtraction
- Terms can be rearranged using commutative and associative properties
4.3 Omission of Multiplication Symbol
- In algebra, multiplication sign (×) is often omitted for brevity
- 4 × n is written as 4n
- Number is written first, then the letter: 4n, not n4
4.4 Simplification of Algebraic Expressions
- Like terms have the same variable part and can be combined
- Combine coefficients of like terms: 3a + 5a = 8a
- Unlike terms cannot be combined: 2a + 3b stays as 2a + 3b
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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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