To work this out, you first have to break the two numbers into their prime factors:
50 = 2x5x5
54 = 2x3x3
The next step is to identify any common prime factors. In this case both numbers have a 2 as a prime factor. Therefore the GCF of 50 and 54 is 2.
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The greatest common factor of 54 , 90 = 18
The greatest common factor of 54 and 46 is 2.
The greatest common factor of 21 and 54 is 3. The greatest common factor is the highest number that divides exactly into two or more numbers. factors of 21: 1, 3, 7, 21 factors of 54: 1, 2, 3, 6, 9, 18, 27, 54 The greatest common factor of 21 and 54 is 3.
The Greatest Common Factor (GCF) is: 1
The greatest common factor of 54 and 100 is 2.