Revision Notes for Class 7 Maths Chapter 2: Arithmetic Expressions

Condensed revision notes for Class 7 Maths Chapter 2: Arithmetic Expressions – Ganita Prakash textbook. These Class 7 Mathematics Chapter 2 notes are ideal for quick revision just before exams.

• Term: a part of an expression separated from the rest by a + or − sign; a multiplication/division chunk (like 7×23) counts as one term.
• Terms can be reordered freely without changing the expression’s value (this includes negative terms).
• Subtracting a number = adding its negative (e.g. 56−17 = 56+(−17)).
• Removing a bracket preceded by “+”: signs inside stay the same. Removing a bracket preceded by “−”: every sign inside flips.
• Distributive law: a×(b+c) = a×b + a×c, and a×(b−c) = a×b − a×c — useful both for simplifying expressions and for quick mental multiplication (e.g. 95×8 = (100−5)×8 = 800−40 = 760).
• Order of operations: evaluate multiplication/division “chunks” (terms) first, then combine terms left to right using their + or − signs; brackets are evaluated first of all.
• Sanity check: the same expression can often be evaluated two different ways (grouping differently) to double-check the answer.

More on this chapter: NCERT Solutions for Class 7 Maths Chapter 2 | Extra Questions for Class 7 Maths Chapter 2 | Class 7 Maths Book | Formulas Handbook

Written by Satish

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