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Math for Kids23 chapters | 325 lessons

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Instructor:
*Dina Albert*

When you share food with a friend, you are splitting or dividing it between the two of you. In this lesson, you will learn how to divide by two using a quick and simple rule.

Imagine you are at the store looking at cookies. You know you want to buy a pack of 6 cookies and share them equally with your friend, but how do you know if you each of you will get an equal number of cookies? Knowing the divisibility rule for 2 will help you solve this dilemma without having to guess or whip out your calculator.

The **divisibility rule for 2** is a short cut for figuring out if a number is divisible by 2 without having to actually solve the division problem. The rule says that any number that ends in a 0, 2, 4, 6, or 8 can be divided by 2 to produce a whole number. So, all **even numbers** (numbers that always end in 0, 2, 4, 6 or 8) are divisible by 2.

Now let's take this rule and solve your cookie dilemma. You have 6 cookies, which we know is an even number. With this simple piece of information, we can determine that 6 is divisible by 2. Your answer, then, is that you can share 6 cookies equally with a friend.

We can check our answer using math: 6/2 = 3 with nothing left over, so 6 is divisible by 2.

Which of the following numbers is divisible by 2:

25 or 26?

Well, our rule says that any number divisible by 2 will end in 0, 2, 4, 6, or 8 (in other words, any even number will be divisible by 2). Of the two choices, only the number 26 ends in an even number, so it is the only one that is divisible by 2.

Is the number 5,467 divisible by 2?

Again, all we need to do is look at the last digit, which is 7. The divisibility rule of 2 tells us that, since this digit is not 0, 2, 4, 6, or 8 (it is not even), it is not divisible by 2.

Let's double-check by doing the math. If you whip out a calculator and type in 5,467 / 2, you get 2,733.5. The answer is not a whole number, which means 5,467 is not divisible by 2.

The divisibility rule for two states that any number with the last digit of 0, 2, 4, 6, or 8 will be divisible by 2. Simply put, any even number is divisible by 2. If the number is not an even number, it is not divisible by two.

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14 in chapter 4 of the course:

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Math for Kids23 chapters | 325 lessons

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