Even and Odd Rules: Part 2

Contributor: Meghan Vestal. Lesson ID: 11295

In addition to knowing if a number is odd or even, you can predict if the sum of two large numbers will be odd or even in addition! Learn and practice the secret with a new worksheet and online quiz!

categories

Elementary

subject
Math
learning style
Visual
personality style
Lion, Beaver
Grade Level
Intermediate (3-5)
Lesson Type
Quick Query

Lesson Plan - Get It!

Audio:

Without solving the problem, determine whether the sum will be even or odd:

31,622 + 98,868 =

In the first Related Lesson of this series, found in the right-hand sidebar, you learned what makes a number even or odd.

On a separate piece of paper, write down two ways to determine if a number is even and two ways to determine if a number is odd. Check over your list with a teacher or parent. If you are having trouble remembering what classifies a number as even or odd, go back and review this Related Lesson before moving forward. You will need to know what makes a number even or odd to complete this lesson.

Did you know you do not actually have to compute a problem to figure out whether the answer will be even or odd? In this lesson, you will learn a few tricks for identifying whether a sum or difference will be even or odd. The rules for knowing whether a sum will be even or odd are:

even + even = even

6 + 4 = 10

odd + odd = even

9 + 3 = 12

odd + even = odd

5 + 4 = 9

even + odd = odd

2 + 7 = 9

 

The same rules apply for subtraction:

even - even = even

6 - 4 = 2

odd - odd = even

9 - 3 = 6

odd - even = odd

5 - 4 = 1

even - odd = odd

8 – 5 = 3

Being able to guess whether a sum or difference will be even or odd is a fun trick! Move on to the next section to try it out.

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