(d) 21.30 Factors of 21
Factors of 30 :
Common factors of 30 and 21 and :
Answers
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30
Step-by-step explanation:
Common factors of 21 and 30
The biggest common factor number is the GCF number. So the greatest common factor 21 and 30 is 3.
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6
The factors of 21 are 21, 7, 3, 1.
The factors of 30 are 30, 15, 10, 6, 5, 3, 2, 1.
The common factors of 21 and 30 are 3, 1, intersecting the two sets above.
In the intersection factors of 21 ∩ factors of 30 the greatest element is 3.
Therefore, the greatest common factor of 21 and 30 is 3.
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