Addition Properties
This property keeps the number the same as the sum.
Identity property.
This is referred to as the addend.
The numbers you add to find the sum.
The best time to estimate a sum.
When you are adding large numbers.
What is regrouping?
When you need to carry the number over when it is greater than 9.
Jason read 45 pages on Monday night and 26 pages on Tuesday night. How many pages did he read?
71.
This property allows the numbers to associate with one another using paranthesis.
Associative property.
7+X=11
4
True or false, when you estimate 256 is estimated as 250.
True
16+15=X
31
The second grade collected 243 bottle caps, and the third grade collected 534. How many total did they collect?
777
This property allows you to add numbers in any order and get the same sum.
Community property.
12+X=24
12
What is the estimated sum of 745+45?
800
What is the sum of 150+75?
225
Gavin had $300. His grandmother gave him $150. How much money does he now have?
$450
True or false: an example of the identity property is 0=7+0
True
135+X=170
35
What is the estimated sum of 185+24
220.
What is 49+57=X
106
It takes 14 miles to drive to Mrs. Najimy's house. How many miles does it take her to drive there and back?
28.
What is the sum of (5+6)+2?
13
145+X=250
105
A family trip involved driving 731 miles to its first stop and 475 miles to its second. About how far has the family traveled?
1,200 miles.
378+950=?
1,328
How many feet of wood would be needed to finish a 276 foot long bridge, if 155 feet have already been completed?
121 feet.