Vocabulary
The value given to a digit by its position in a number is its _______________.
Place Value
Round to the hundredths place.
0.781
0.78
A family is staying in a hotel for 2 nights. The hotel costs $91.35 a night. About how much will they pay for the hotel?
$90 + $90 = $180
This rule allows you to add numbers in any order.
5.4 + 7.9 + 4.6 = 5.4 + 4.6 + 7.9
Commutative Property of Addition
Round to the ones place.
17.93
18
Jesse had three long jumps during a track meet of 17 feet, 18 feet, and 15 feet. Andrew had three long jumps during a track meet of 17 feet, 15 feet, and 18 feet. Overall, who had a greater total jump distance. Which addition property can you use to find the answer without adding?
Jesse and Andrew jumped the same total distance.
Commutative Property of Addition
When computing using actual numbers, you find a(n) ___________________.
Exact Answer
Round each decimal to the nearest tenth. Then add or subtract.
17.16 - 9.01 = ______
17.2 - 9.0 = 8.2
You have to be 48 inches 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
1.5 + 1.5 = 3
45 + 3 + 48
When you round a number, you find its ____________.
Estimate
Round each decimal to the nearest tenth. Then add or subtract.
62.84 + 74.2 = _____
62.8 + 74.2 = 137
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 book store?
$6.39 + $3.99 = $10.38
$10.52 + $10.38 = $20.90
To ____________ is to form into a new or restructured group or grouping.
Regroup
Just add.
6.07 + 1.34 = _______
7.41
The ____________________ states that the sum of any number and o equals the number.
Identity Property of Addition
Just add.
$1.06 + $4.89 = _______
$5.95
Subtracting results in finding the ________________ between two numbers.
Difference
Just add.
4.15 + 20.68 = ______
24.83
The ___________________ states that the way in which numbers are grouped does not change the sum.
Associative Property of Addition
Just subtract.
4.15 - 1.29 = ______
2.86
Just subtract.
$13.78 - $5.41 = ______
$8.37
Just subtract.
8.3 - 4.7 = _____
3.6