Interactive
CK-12 Foundation

Prime and Composite Numbers

For Students 4th - 8th Standards
Nine true or false, multiple-choice, and discussion questions make up an interactive designed to reinforce scholars' knowledge of prime and composite numbers. A number chart reveals every prime number through 100. 
Lesson Plan
Curated OER

Missing Factors

For Teachers 3rd - 5th
Students explore factors. They discuss factors, factor trees and prime factors. Students practice working with and finding various factors and prime factors. They discuss methods used to find factors.