**Number Sense and Numeration Lesson 1 – Upside Down Addition**

by Elaine Ernst Schneider

**Objective(s): By the end of this lesson the student will be able to:**

1. (2m21) Investigate the properties of whole numbers: addition fact families

2. remember this rule of operations:

**Addition and Multiplication can Always be Mixed up.**

**For Subtraction and Division, Same order is Desired.**

**Note to teacher, parent, or tutor:**These problems demonstrate the commutative operation when dealing with addition and multiplication. Teaching this as a foundational truth now will facilitate pre-algebra concepts that your child will meet with in the future.

**Outline:**

Did you know that if you add 4 and 3, it is the same as adding 3 and 4?

4 3

__+ 3 __ __+ 4__

7 7

Both problems have the same answer! That means that when you add, you can turn the problems upside down and you will get the same answer. That’s a neat trick! Let’s try some more problems.

**Assignment(s): **

5 6 3 2

__+ 6 __ __+ 5 __ __ + 2 __ __+ 3__

2 7 5 4

__ + 7 __ __+ 2 __ __+ 4 __ __ + 5__

8 3 2 9

__ + 3 __ __+ 8 __ __+ 9 __ __+ 2__

Circle the correct choice:

1. The answers for the first row are (in order)

a) 12, 12, 6, 6

b) 11, 11, 11, 11

c) 11, 11, 5, 5

d) 9, 9, 11, 11

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