Class 7 · Chapter 11
Finding Common Ground
Highest common factors, lowest common multiples, and applications.
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Ganita Prakash · Class 7 Part 2 (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
Factorise both; multiply common primes to lowest power. HCF.
Key concepts & formulas
01
HCF: largest number dividing both.
02
LCM: smallest number both divide.
03
For : HCF LCM.
04
Use for fraction simplification, timing/gear problems.
05
Prime factorisation is a reliable method.