CHAPTER 1 LESSON 3
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“MORE THAN TWO
ADDENDS”
Remember addends? They are the numbers we add in the problem.
This lesson we will add with more than
two addends.
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.
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NOW YOU TRY
ADD
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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 |
|
|
|
|
|
|
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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 |
How did you
do? Check your answers and see
J
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