Khan Academy
Prime Factorization, Factors and Multiples, Pre-Algebra
Older elementary students will appreciate how clearly Sal explains how to find the prime factorization of 75. He shows the complete process, taking note of numbers that are and are not primes, and why.
Curated OER
How Do You Find the Prime Factorization of a Number Using a Tree?
A factor tree? What's a factor tree? A tree of factors? A factor tree is a method use to do the prime factorization of an integer. It's not complicated. Watch the teacher as she explains the steps and shows how to write the answer as a...
Curated OER
Prime Numbers Sieve
A very quick look at a multiplication table and how to eliminate numbers according to multiples of 2,3, 5, and 7. After eliminating these multiples, the numbers you are left with are prime.
Math Playground
How Do You Find GCF and LCM?
Using the numbers 225 and 270, the narrator explains how to find the greatest common factor and the least common multiple. This presentation could be used in conjunction with other videos in a series exploring how to identify prime...
Khan Academy
MTEL Math Practice Test: 12-15
This video discusses prime factorization and prime or natural numbers. Sal shows viewers how to solve these problems and one with expressions representing a given volume.
Curated OER
Prime Numbers Stop Action
A stop action video demonstrating how 2,3, 5, 7, and 11 are prime numbers. There is no dialogue in the video so the class has to pay attention and be able to read to follow the video. I recommend playing the music on low volume so as not...
Curated OER
Prime Numbers Song
Prime numbers are very special numbers. This clip defines what a prime number is and then provides a song to help students remember what they are. This could be a very helpful teaching strategy for kinesthetic learners. Music builds memory.
Curated OER
Prime Numbers Explained
Rushton explains prime and composite numbers by showing what numbers can be multiplied to get the numbers 1 - 11. He also explains that 0 and 1 are special numbers.