Curated OER
Primes and Prime Factors
In this primes and prime factors worksheet, 8th graders solve 21 different problems to include identifying each number as prime, composite, or neither prime nor composite and listing all the primes less than 200. Then they complete each...
Curated OER
Perfect Squares and Factoring
In this perfect squares and factoring activity, students solve and complete 26 different problems that include a number of polynomials. First, they determine whether each trinomial is a perfect square trinomial and factor if possible....
Curated OER
Factoring Trinomials
For this factoring trinomials worksheet, students solve and complete 28 different problems. First, they factor each trinomial, if possible. Then, students use integers to factor out those that cannot be factored and write prime.
Math Is Fun
Math Is Fun: All Factors of a Number
Great tool that will find all factors of a number, not just the prime factors.
Scholastic
Scholastic: Study Jams! Math: Multiplication & Division: Prime Factorization
This site provides great practice on the concept of prime factorization. Students can first learn about the topic by watching a step by step instruction video that also points out areas of concern. Finally, students can practice their...
Math.com
Math.com: Greatest Common Factor/practice Calculator
A page which generates number pairs and allows the user to find and enter the GCF. Keeps a running tally of correct/incorrect answers and has links to in depth review, if needed.
Math Is Fun
Math Is Fun: Prime Factorization
Find a definition or prime numbers and prime factorization, as well as examples on how to find the prime factors of 12 and 147. Also, follow a link to a Prime Factorization Tool.
University of Vienna (Austria)
University of Vienna: Elementary Properties of Numbers
Quick interactive assessment which determines skill level on fraction equivalence, prime factorization, and common divisors/multiples.
Other
Greatest Common Factor/definition and Example
A walkthrough example of the discovery of the GCF of three numbers. Contains a definition as well.
Other
Greatest Common Factor/example
An example (with full explanation) where a Greatest Common Factor is found.