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Question
The HCF of 144 and 198 is
Options
9
12
6
18
Solution
2 × 32 = 18
We first factorise the two numbers:
144 = 2 × 2 × 2 × 2 × 3 × 3 = 24 × 32
198 = 2 × 3 × 3 × 11 = 2 × 32 × 11
Here, 18 (2 × 32 = 18) is the highest common factor of the two numbers.
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