HCF Master Class

1. Concepts • 2. Listing Lab • 3. Venn Lab • 4. Game

1. Two Ways to Find HCF

Method A: Factor Listing

12: 1, 2, 3, 4, 6, 12
18: 1, 2, 3, 6, 9, 18
Best for small numbers

Method B: Prime Venn

12 = 2 × 2 × 3
18 = 2 × 3 × 3
Overlap: 2 × 3 = 6
Best for big numbers

2. Lab A: The Factor Scanner

List all factors. Find the highest match.

3. Lab B: The Venn Machine

Break them into primes. Multiply the intersection.

HCF = ?

HCF Hunter

20 Rounds | Find the Highest Common Factor

Best0

Score0

Round1/20

Level 1: Factor Pairs

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