Calculate the Greatest Common Factor or GCF of 136 and 210
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The instructions to find the GCF of 136 and 210 are the next:
1. Decompose all numbers into prime factors
136 | 2 |
68 | 2 |
34 | 2 |
17 | 17 |
1 |
210 | 2 |
105 | 3 |
35 | 5 |
7 | 7 |
1 |
2. Write all numbers as the product of its prime factors
Prime factors of 136 | = | 23 . 17 |
Prime factors of 210 | = | 2 . 3 . 5 . 7 |
3. Choose the common prime factors with the lowest exponent
Common prime factors: 2
Common prime factors with the lowest exponent: 21
4. Calculate the Greatest Common Factor or GCF
Remember, to find the GCF of several numbers you must multiply the common prime factors with the lowest exponent.
GCF = 21 = 2
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