Ever need to find the GCF of two numbers? Here’s a trick for finding the GCF of any two numbers — very quickly. This is an original trick, so I doubt you’ll find it anywhere else online. But most important, it’s easy to use, and it works no matter how large the numbers might be. Also nice … learning this […]

# Archive | GCF / GPGCF

# The GCF (aka GCF) … what is it?

The GCF is the greatest common factor, and it’s a key concept in math. This term is also known as the GCD, the greatest common divisor. Students often need to find this quantity either for a pair of numbers or for three or more numbers. For example, knowing the greatest common factor allows students to reduce […]

# Divisibility: Find out if 3 divides evenly into an integer

Learning the divisibility tricks speeds up mental math. How to know if 3 divides into a number evenly? This blog tells you how

# From GPGCF to GCF … in two easy steps

For any pair of numbers, how to find the GCF once you know the GPGCF.