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Solution - Greatest common factor (GCF)
1
Other Ways to Solve:
Step by Step Solution
Calculate Greatest Common Factor for :
21, 15 and 5
Factorize of the above numbers :
21 = 3 • 7
15 = 3 • 5
5 = 5
Build a prime factors table
| Prime Factor | Number 21 | Number 15 | Number 5 | G.C.F (min) |
|---|---|---|---|---|
| 3 | 1 | 1 | 0 | 0 |
| 5 | 0 | 1 | 1 | 0 |
| 7 | 1 | 0 | 0 | 0 |
GCF = 1
Greatest Common Factor is :
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