Study guides
How to Add and Subtract Fractions (Common Denominators Made Easy)
Adding and subtracting fractions is easy once you understand common denominators. Learn what a common denominator is, how to find one, and how to simplify — with worked examples.
What Is Prime Factorization? A Beginner's Guide
Learn what prime factorization is, how to do it step by step, and why it helps with greatest common divisors, least common multiples, and simplifying fractions.
What Is Simplifying Fractions? Steps and Tips
Learn what simplifying (reducing) a fraction means and how to do it, using the greatest common divisor. Includes tips to avoid the common mistake of stopping too early.
How to Find the Greatest Common Divisor (Two Methods)
Learn how to find the greatest common divisor (GCD) using two methods: listing divisors and prime factorization. Includes tips for three or more numbers and using the GCD to simplify fractions.
How to Find the Least Common Multiple
Learn how to find the least common multiple (LCM) two ways: listing multiples and prime factorization. Includes how it helps with common denominators and mistakes to avoid.
What Are Prime Numbers? How to Spot Them
Learn what prime numbers are, how to spot them, and see a list of the smaller primes. Includes why 1 is not prime and how primes connect to prime factorization.