CHAPTER 1                            LESSON 3

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First, let’s look at the ----

The Grouping Property

Changing the grouping of the addends does not change the sum.

Example:

(6 + 3)+ 2 = 6 + (3 + 2)

The order and grouping properties allow you to add numbers in any order.  Remember we are only talking about adding.

Let’s look at this example:

6

7

+  4

We can add any two of the numbers at a time.  So let’s add 6 + 4.  That gives us 10.  Now add the 10 to the 7 and our answer is 17.

But if we wanted to add 7 + 4 first.  Well, let’s do that!  Add 7 + 4.  That gives us 11.  Now add the 11 to 6.  Add 11 + 6 and that gives us 17.  See—it does not matter what two numbers you want to add first.  So in addition, we can add any two numbers first and then add the other numbers left.

NOW YOU TRY

 1.     3 2.      5 3.       2 4.      3 5.      4 5 4 3 7 2 +    7 +   6 +    8 +    5 +   6 6.     2 7.      1 8.       7 9.      3 10.      2 8 4 3 6 7 +    4 +   9 +    6 +    4 +   8 11.      8 12.     3 13.     8 14.     7 15.      8 2 7 7 4 4 6 2 2 2 3 +    1 +  6 +  1 +  3 +    2 16.      3 17.     4 18.     3 19.     2 20.      1 2 5 4 6 5 9 3 4 2 7 +    5 +  3 +  2 +  3 +    2 21.      5 22.     6 23.     6 24.     9 25.      6 1 2 4 2 7 9 8 4 1 3 8 4 3 3 4 +    5 +   1 +   7 +   8 +    5 26.      8 27.     4 28.     5 29.     2 30.      3 1 3 5 8 3 2 7 5 6 7 4 8 1 9 4 +    7 +   2 +   9 +   4 +    4