Properties of Addition
The commutative property says that...
a. we can add numbers in any order
b. adding 0 to any number will equal that number.
c. the way we group the numbers doesn't change our outcome.
a. we can add numbers in any order.
6.07 + 1.34
= 7.41
4.15-1.29
=2.86
Round to the nearest hundredths: 0.781
.78
A family is staying in a hotel for two nights. The hotel costs $91.35 a night. About how much will they pay for the hotel?
$90 + $90 = $180
The associative property says that...
a. we can add numbers in any order
b. adding 0 to any number will equal that number.
c. the way we group the numbers doesn't change our outcome.
c. the way we group the numbers doesn't change our outcome.
62.84 + 74.2
=137.04
13.78-5.41
=8.37
Round to the nearest ones: 17.93
18
Jesse had three long jumps during a track meet of 17 ft, 18 ft, and 15 ft.
Andrew had three long jumps during a track meet of 17 ft, 15 ft, and 18 ft.
Overall, who had the greater total jump distance?
The distances are equal!
The identity property says that...
a. we can add numbers in any order
b. adding 0 to any number will equal that number.
c. the way we group the numbers doesn't change our outcome.
b. adding 0 to any number will equal that number.
$1.06+ $4.89
= $5.95
8.3-4.7
3.6
Round each decimal to the nearest tenth then subtract.
17.16-9.01
8.2
You have to be 48 inches tall to ride the roller coaster. Eva is 45 inches tall. If she grows 1.5 inches each year, will she be able to ride the roller coaster in 2 years?
Yes, 45 + 1.5 +1.5 = 48
Which property is used here?
4+2+6 ---> 4+6+2
Commutative; we changed the order.
4.15+20.68
=24.83
4.32-2.14
2.18
Round each decimal to the nearest tenth. Then add.
62.84 + 74.2
137.0
Micah had $10.52 after he left the book store. If he bought a book for $6.39, and a magazine for $3.99, how much money did he have before he went to the bookstore?
a. $0.14
b. $10.38
c. $16.91
d. $20.90
d. $20.90
Which property is used here?
4+6+2 ----> (4+6)+2
Associative; we changed the groupings.
12.4+10.42
= 22.82
17.89-4.32
13.57
When you round a number you find its:
a. estimate
b. new value
c. its twin
d. exact answer
a. estimate
Marcus swam .72 mile and ran 1.65 miles. How far did Marcus travel in all?
2.37 miles