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Question
The greatest number that is a factor of both 18 and 20 is
The greatest number that is a factor of both 18 and 20 is
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Solution
The correct option is C 2
Factors of 18:
1 × 18
2 × 9
3 × 6
Factors of 20:
1 × 20
2 × 10
4 × 5
The common factors are 1 and 2, and the greatest is 2.
The greatest common factor is termed as HCF.
Therefore, the greatest number that is a factor of 18 and 20 is 2, which is the HCF.
Factors of 18:
1 × 18
2 × 9
3 × 6
Factors of 20:
1 × 20
2 × 10
4 × 5
The common factors are 1 and 2, and the greatest is 2.
The greatest common factor is termed as HCF.
Therefore, the greatest number that is a factor of 18 and 20 is 2, which is the HCF.
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