McGraw Hill
Glencoe: Self Check Quizzes 1 Divisibility Patterns
Use Glencoe's randomly generated self-checking quiz to test your knowledge of divisibility patterns. Each question has a "Hint" link to help. Choose the correct answer for each problem. At the bottom of the page click the "Check It"...
Mathigon
Mathigon: Math Foundations: Divisibility and Primes: Divisibility Rules
There are a few different rules that can make it easy to check if a number is divisible by another. In this lesson you will learn some of them such as,any number that ends in 0, 2, 4, 6, or 8 is divisible by 2, divisibility by 5 we...
Cool Math
Coolmath: Pre Algebra Divisibility Tests
Known as Guzzinta Tests, here are some quick tricks you can learn to see if a number is divisible, can be divided by, another number.
Better Lesson
Better Lesson: Divisibility Rule for 4 and 5
Using calculators allows students to experiment and to discover patterns, in this case resulting in a divisibility rule for the number 4.
National Council of Teachers of Mathematics
The Math Forum: Divisibility Test Game "Nullo"
The lesson plan for two to four players engaged in an active card game to determine the divisibility of a number. The materials needed, the rules of the game, and the methods of scoring are all explained for the teacher.
Homeschool Math
Homeschool Math: Divisibility Rules
This is a complete lesson plan about the concept of divisibility and common divisibility rules. It briefly reviews the concepts of factor, divisor, and a number being divisible by another. Then, the "easy" divisibility rules by 2, 5, 10,...
Texas Instruments
Texas Instruments: Divisibility Rules! Using Scientific Calculators
Concepts and skills covered in this activity include number theory, divisibility rules, multiples, factors, and problem-solving skills.
Better Lesson
Better Lesson: Divisibility Rules and Properties of Math Quiz
SWBAT show their understanding of the divisibility rules.
Better Lesson
Better Lesson: Divisibility Rules Foldable
A hot dog fold serves as a divisibility rules study guide.
Better Lesson
Better Lesson: Divisibility Rules for 6 and 9
Sixth graders use calculators to find the shortcut for dividing with 6 and 9.
ClassFlow
Class Flow: Divisibility & Factorials
[Free Registration/Login Required] Testing for divisibility of 0, 2, 3, 4, 5, 9, 10 & 11. This flipchart explores factorials and perfect numbers as well.
Mathigon
Mathigon: Math Foundations: Divisibility and Primes: The Distribution of Primes
This lesson focuses on the distribution of large prime numbers. It offers a calculator to check numbers for prime and a calculator that allows you to create prime numbers. It also provides the history of methods find the distribution of...
Mathigon
Mathigon: Math Foundations: Divisibility and Primes: Prime Numbers
This lesson focuses on prime numbers, numbers that can only be divided by one and itself. It explains the Fundamental Theorem of Arithmetic and the Sieve of Eratosthenes. Includes practice activities.
Better Lesson
Better Lesson: Basic Fractions on a Number Line (Divisible by Two)
Third graders create number lines to represent benchmark fractions.
Lesson Tutor
Lesson Tutor: Divisibility Rules
A handy table of the rules of division is presented here. Examples are given for each of the rules, from the number 2 to the number 10. The site stresses that a list such as this isn't cheating, but rather a nice resource to have.
Quia
Quia: Divisibility and Prime
If you enjoy playing the game Battle Ship you will enjoy this game. When you locate an enemy ship to get the hit you must correctly answer a question using your knowledge of divisibility rules and prime numbers. It is a fun way to...
Illustrative Mathematics
Illustrative Mathematics: 4.oa Multiples of Nine
This task examines the interesting fact that when a number is divisible by 9 then the sum of its digits is also divisible by 9. Aligns with 4.OA.C.5.
TED Talks
Ted: Ted Ed: Why Can't You Divide by Zero?
Learn about the math rule that says we cannot divide by zero.
Other
Eratosthenes' Prime Number Sieve
Discover all the primes up to the number 400 by using this interactive table. Simply click on a number and its multiples disappear.
ClassFlow
Class Flow: Number Sense Related to Division
[Free Registration/Login Required] This flipchart introduces divisibility, primes and composites, averages, and estimating quotients.
AAA Math
Aaa Math: Counting Even Numbers by Twos
Use this lesson to learn about adding two and skip counting to understanding the concepts of counting even numbers by twos. Play the interactive game "Counting Up By Twos," and get your score instantly.
National Council of Teachers of Mathematics
The Math Forum: Beat the Calculator: Adding Even Numbers
Can you beat the calculator? Your task is to find the sum of all even numbers between two and any selected two-digit even number. If you can find the number pattern, you are sure to beat the calculator every time. Links to other "Beat...
University of Cambridge
University of Cambridge: Nrich: Two Primes Make One Square
On this one page website sharpen your logic, prime numbers and square numbers skills while working on this challenge. The solution is available to double check your solution.
Other
Historical Narratives of Early Canada: One Kingdom Divisible
This web page examines Benjamin Franklin, the Boston Tea Party, First Continental Congress, and the Second Continental Congress in 1775, where Canadians were invited to attend. Learn more about the flow of revolution and loyalty on each...