Mathigon: Math Foundations: Divisibility and Primes: Prime Numbers

Who knew the sum of a number's digits gives such interesting information? The 18th installment of a 21-part module has scholars investigate division by three and nine. After looking at several examples, they develop divisibility tests...

What a useful resource! Use this presentation to introduce your learners to the rules of divisibility. This step by step exploration lists the rules for dividing by 2, 3, 4, 5, 6, 8, and 9. Practice questions are included. Excellent!

Examine the processes for determining the divisibility of a number. Some divisibility rules are simple, such as divisible by two or five, while others are more complex. The video explains the divisibility rules for numbers from two...

Equipped with several examples from the attached module and from standardized tests, Sal takes viewers through the process of prime factorization and divisibility. He demonstrates each skill several times with many different numbers,...

Learning division is a challenge for many young mathematicians, but this presentation on divisibility rules can make it much easier. Seven different rules are clearly explained and modeled with the support of multiple examples. Consider...

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...

This lesson focuses on factors and multiples; it explains each and provides practice activities and a quiz.

How will learning about the divisibility rules help you do better in math? Well, if you have multi-digit numbers to factor, these rules will definitely help you factor numbers more quickly.

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...

What do divisibility and factoring have to do with each other? Well, if a whole number is the divisor and a whole number is the answer then both those numbers are factors of the number being divided. But if the answer is a decimal number...