Question
Find the largest number that completely divides 15, 45 and 60.
✓
Answer
Factors of 15 = 1, 3, 5, 15
Factors of 45 = 1, 3, 5, 9, 15, 45
Factors of 60 = 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60
Common factors of 15, 45 and 60 = 1, 3, 5, 15.
Therefore, 15 is the greatest number that completely divides 15, 45 and 60.
Factors of 45 = 1, 3, 5, 9, 15, 45
Factors of 60 = 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60
Common factors of 15, 45 and 60 = 1, 3, 5, 15.
Therefore, 15 is the greatest number that completely divides 15, 45 and 60.
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