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Question
The heights of two statues are 90 meters and 180 meters respectively. The greatest common divisor (GCD) of their heights is:
The heights of two statues are 90 meters and 180 meters respectively. The greatest common divisor (GCD) of their heights is:
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Solution
The correct option is C 90
Find the factors of 90 and 180
Factors of 90: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90.
Factors of 180: 1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, and 180.
Number 90 is the common factor which is the greatest factor.
Hence, 90 is the greatest common factor of their heights.
Find the factors of 90 and 180
Factors of 90: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90.
Factors of 180: 1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, and 180.
Number 90 is the common factor which is the greatest factor.
Hence, 90 is the greatest common factor of their heights.
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