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# I want to learn about: Divisibility

Content about divisibility in elementary mathematics. Here you will find information about divisibility adapted for elementary aged children to make learning mathematics easier and more fun.

Apr06

## The Reason for Divisibility Criteria Sometimes we may be interested in knowing if one number is divisible by another, without having to perform a division. This is especially useful when we work with large numbers that require a lot of time for completing calculations. If you would like to refresh your memory on divisibility criteria, take a look at this […]

Sep02

## What is Factorial Decomposition? In today’s post we are going to answer the question, what is factorial decomposition? I hope that by the end of the post you’ll have it crystal clear. Definition of Factorial Decomposition We are going to start by remembering what a ”factor” is in mathematics. A factor is every number that is multiplied by another. […]

Dec31

## Divisibility by 4: How Do We Know If a Number Is Divisible by 4? In this post, we are going to learn the criteria for divisibility of the number 4 and understand how they function. The divisibility criteria for the number 4 are rules to know if a number can be divided by 4. They are simple to learn and their explanations are easy to understand. How do we […]

Dec24

## Some Prime Number Curiosities For this entry, we are going to learn some surprising facts about prime numbers. We would recommend reading our post about prime and composite numbers first, to refresh your knowledge about these numbers. Are you ready to move on? Perfect! I’m sure that you know it is possible to write some numbers as products of others, […]

Jul23

## Explanation of the Formula to Calculate the Least Common Multiple I am sure this sounds familiar to many of you: To calculate the least common multiple (LCM), we have to choose between the common and uncommon factors that have the highest exponent. But what does it mean? Why do we have to choose from all factors…and out of the common factors, why the ones with […]

Nov27

## Prime Numbers: How to Find Them with the Sieve of Eratosthenes In today’s post, we’re going to learn how to find prime numbers using the Sieve of Eratosthenes. A prime number is one which is only divisible by 1 and itself. It’s as simple as that; the downside is that there’s no mathematical formula to make sure whether a number is prime or not. Think of a high number like 191,587. […]

Sep29

## Follow 8 Easy Steps to Factor a Number In this entry, we’re going to explain how to break down or factor a number to its prime numbers step by step. Before we start anything, feel free to look at these entries where we explain what “factoring” means and what a prime number is so you can refresh your memory. Factorization How to factor […]

Aug07

## Divisibility Guidelines for 5 and Some Examples In this post we will learn the criteria of divisibility by 5. A number is divisible by 5 when dividing the number by 5 results in a remainder of zero. But how can we know without having to complete the division? Here we show you the easiest way.   Divisibility criteria for 5: To determine if a number is […]

Jun07

## Follow the Divisibility Guidelines for 3 In the post for this week, I will explain the criteria for the divisibility of 3. When they ask you “Is this number divisible by 3?”  The most intuitive thing to do is to divide that number by 3, and if the remainder is zero then the number itself is divisible by 3. For example: One […] 