Class 7 · Chapter 4
Expressions using Letter-Numbers
Introduction to algebraic expressions and variables.
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Ganita Prakash · Class 7 Part 1 (2026-27)
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Tip: NCERT updated the syllabus for 2026-27. The links above open the latest edition on the official portal — chapter titles and numbering may differ from the notes shown here.
Detailed theory
'Add 5 to ' becomes . 'Twice a number decreased by 3' becomes . Practice translating English into algebra.
Key concepts & formulas
01
A **variable** is a letter representing a number.
02
**Constants** are fixed numerical values.
03
**Terms** in an expression are separated by or .
04
**Like terms** have the same variable to the same power.
05
Combine like terms by adding/subtracting coefficients.