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Greatest Common Factor Calculator. Please provide numbers separated by comma , below and click the Calculate button to use. In mathematics, the greatest common divisor (GCD) is the largest positive integer that divides a group of numbers without a remainder. It is usually denoted by GCD(a, b, ...). Least common multiple is also called the greatest common factor (GCF), highest common factor (HCF), or greatest common measure (GCM). For example, since 20/10=2 and 30/10=3, GCD (20, 30) = 10.
What is the GCF? 4 1. Find the GCF of 8 and 12. List the factors of 8. 1, 2, 4, and 8 List the factors of 12. 1, 2, 3, 4, 6, and 12 List the common factors. 1, 2, and 4 What is the GCF? 4 2. Find the GCF of 15 and 20. List the factors of 15. 1, 3, 5, and 15 List the factors of 20. 1, 2, 4, 5, and 20 List the common factors. 1 and 5 What is the GCF? 5 3. Find the GCF of 21 and 35. List the factors of 21. 1, 3, 7, and 21 List the factors of 35.