Learn how to calculate the lowest common multiple and highest common factor by expressing numbers as a product of their prime factors.

Prime numbers A prime number has exactly two factors, itself and one. The first ten prime numbers are 2, 3, 5, 7, 11, 13, 17, 19, 23 and 29.

When Data Pointed’s Stephen Von Worley stumbled upon a program that creates diagrams of numbers’ prime factors on Brent Yorgey’s The Math Less Traveled, he decided to take the diagrams and ...