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Whiteboard
ClassFlow

Class Flow: Working With Prime and Composite Numbers

For Teachers 3rd - 8th Standards
[Free Registration/Login Required] This flipchart allows students to practice working with prime and composite numbers. Students learn how to do prime factorization.
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Unit Plan
Other

University of Surrey: The First 500 Fibonacci Numbers

For Students 9th - 10th
A list of the first 500 Fibonacci numbers, including their prime factorization and whether they are prime.
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Unit Plan
Homeschool Math

Homeschool Math: Prime Factorization of Three Digit Numbers

For Teachers 5th
This lesson shows examples of how to get started with the prime factorization of three-digit or larger numbers, using a factor tree. includes numerous practice exercises.
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Activity
Purple Math

Purplemath: Factoring Numbers

For Students 3rd - 8th Standards
Visit Purplemath.com for a lesson on finding the prime factorization of numbers. Numerous examples are worked through step by step.
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Unit Plan
CK-12 Foundation

Ck 12: Arithmetic: Prime Factorization

For Students 6th
[Free Registration/Login may be required to access all resource tools.] Write the prime factorization of given numbers.
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Unit Plan
Cool Math

Coolmath: Pre Algebra: Prime Factorizations

For Students 4th - 6th Standards
In this tutorial, students learn how to do prime factorization by a few different methods, including factor trees and factor stacks. The exercises work their way up from 2-digit numbers up to 5 digits. Includes practice problems.
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Handout
Cuemath

Cuemath: Highest Common Factor

For Students 9th - 10th Standards
Explore the world of Highest Common Factor or Greatest Common Factor (GCF) by going through its various aspects and properties. Find answers to questions like what is the highest common factor for a group of numbers, easy ways to...
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Activity
Shodor Education Foundation

Shodor Interactivate: Factorize

For Students 3rd - 8th Standards
This Shodor site gives a brief explanation of factorization, and it allows you "to find all of the factorizations of a given number and then draw the product as the area of a rectangle on a grid."
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Unit Plan
TED Talks

Ted: Ted Ed: Marcus Du Sautoy: Symmetry, Reality's Riddle

For Students 9th - 10th
Oxford mathematician, Marcus du Sautoy, presents a brief look of the invisible numbers that unite all symmetrical objects as he discusses prime numbers, symmetry groups, higher dimensions and other stumpers. [18:20]
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Graphic
University of Utah

University of Utah: The Sieve of Eratosthenes

For Students 9th - 10th
Site gives an explanation of the Sieve of Eratosthenes, a table for prime numbers.
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Handout
Varsity Tutors

Varsity Tutors: Hotmath: Algebra Review: Prime Factorization

For Students 9th - 10th Standards
Find a quick, concise explanation of how to find the unique prime factorization of a number. An example is given and clearly explained.
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Website
Shmoop University

Shmoop: Basic Operations: Prime Factorization

For Students 3rd - 8th Standards
Students learn about prime factorization. The resource consists of notes, step-by-step examples, and practice problems with solutions.
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Whiteboard
SMART Technologies

Smart: Factors and Multiples

For Teachers 3rd - 6th Standards
Students are introduced to prime numbers, composite numbers, prime factorization, greatest common factor, and least common multiple in this SMART whiteboard activity.
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Activity
National Institute of Educational Technologies and Teacher Training (Spain)

Ministerio De Educacion: Divisores Y Primos

For Students 3rd - 8th Standards
Reinforce your knowledge on prime numbers and their divisors.
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Activity
University of Cambridge

University of Cambridge: Nrich: A Conversation Piece

For Students 3rd - 8th Standards
On this one page website sharpen your logic, division and prime number recognition skills while working on this challenge. The solution is available to double check your solution.
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Activity
National Institute of Educational Technologies and Teacher Training (Spain)

Ministerio De Educacion: Primos Gemelos

For Students 3rd - 5th Standards
A twin prime is a prime number that differs from another prime number by two. Learn about them with these exercises.
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Activity
Texas Instruments

Texas Instruments: Factors Galore C: Prime Factorization

For Teachers 6th - 8th
In this activity, students use the calculator to find the prime factorization of a number.
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Unknown Type
University of Vienna (Austria)

University of Vienna: Elementary Properties of Numbers

For Students 9th - 10th Standards
Quick interactive assessment which determines skill level on fraction equivalence, prime factorization, and common divisors/multiples.
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Interactive
Mangahigh

Mangahigh: Number: Find Prime Factors

For Students 5th - 7th
Test your knowledge of prime factors of two-digit numbers.
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Whiteboard
ClassFlow

Class Flow: Factoring, Prime and Composite

For Teachers 3rd - 8th Standards
[Free Registration/Login Required] This flipchart defines factors, prime number, and composite numbers. It gives step-by-step instructions on how to list all the factors of a whole number and then identify the number as a prime number or...
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Activity
Other

Fascinating Triangular Numbers

For Students 9th - 10th
Patterns of numbers don't come along every day, and so when they do, they need to be bragged about! The basic definition of triangular numbers begins this site which also lists many of the properties of these numbers, highlights the...
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Unit Plan
E-learning for Kids

E Learning for Kids: Math: Inca Temple: Number Sense

For Students 5th - 6th
Do you want to know how to pronounce really big numbers? Paul can teach you!
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Interactive
Doina Popovici

Math Play: Prime Factorization Game

For Students 4th - 6th Standards
Students can practice factorization in this online game.
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Interactive
Doina Popovici

Math Play: Prime Factorization Game

For Students 5th - 7th
Students can practice prime factorization in this online game that can be played individually or in teams.

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