GCF for 13 and 21
"Greatest Common Factor" Calculator
What is the Greatest common Divisor of 13 and 21?
Answer: GCF of 13 and 21 is 1
(One)
Finding GCF for 13 and 21 using all factors (divisors) listing
The first method to find GCF for numbers 13 and 21 is to list all factors for both numbers and pick the highest common one:
All factors of 13: 1, 13
All factors of 21: 1, 3, 7, 21
So the Greatest Common Factor for 13 and 21 is 1
Finding GCF for 13 and 21 by Prime Factorization
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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 13 and 21? (The answer is: 1). Select the first number (e.g. '13') and the second number (e.g. '21'). 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