GCF for 28 and 81
"Greatest Common Factor" Calculator
What is the Greatest common Divisor of 28 and 81?
Answer: GCF of 28 and 81 is 1
(One)
Finding GCF for 28 and 81 using all factors (divisors) listing
The first method to find GCF for numbers 28 and 81 is to list all factors for both numbers and pick the highest common one:
All factors of 28: 1, 2, 4, 7, 14, 28
All factors of 81: 1, 3, 9, 27, 81
So the Greatest Common Factor for 28 and 81 is 1
Finding GCF for 28 and 81 by Prime Factorization
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GCF Table
About "Greatest Common Factor" Calculator
This calculator will help you find the greatest common factor (GCF) of two numbers. For example, it can help you find out what is the Greatest common Divisor of 28 and 81? (The answer is: 1). Select the first number (e.g. '28') and the second number (e.g. '81'). After that hit the 'Calculate' button.
Greatest Common Factor (GCF) also known as the Greatest Common Divisor (GCD) or Highest Common Factor (HCF) - it is the largest positive integer that divides each of the integers with zero remainder