Decimals
ADD:
3.945+ 2.7
6.645
Estimate:
1.44+7.92-3.1=?
About 6
1/2+1/2
1 whole or
2/2
-1/2(-1/2)
1/4
Lydia’s bank account had a balance of −$18.24. She deposited $30.50 in the account. What is
her new balance?
$12.26
SUBTRACT:
7.89-6.4
1.49
Estimate:
0.43+7.99+0.12=?
What is the value of the expression below?
2/10 (-5/6)
-1/6
1/2 divide 2/3
1/6
A storm was coming to town. In the first hour, the temperature changed −2.8o F. In the next hour it changed −4.1o. In the third hour, the temperature change was −5.2o F. What was the approximate change in temperature over the last three hours?
-12 degrees F.
Multiply:
1.2(2.3)
Hint: line up the last digit-check your notes!
2.76
Cheryl was trying to estimate how much to leave for a tip. Her meal cost $12.89, dessert was $3.15 and her drink was $1.25. About how much was Cheryl’s meal?
$17
What is the value of the expression below?
-2/7 + (-2/3)
-20/21
What is the value of the expression below?
-5 1/3 divide 1 1/3
-4
Jasmine jumped from a diving board 10.5 feet off the ground into a pool. She touched the bottom of the pool which was 8.2 feet deep. What is the difference between Jasmine’s highest and lowest points?
18.7 Feet
Does the following expressions have a solution greater than 2?
12.6−10.8
No
1.8
USE COMPATIBLE NUMBERS:
15.1÷4≈
About 4
What is the value of the expression below?
-2/5-7/10
-1 1/10
2/7(7/8)
16/49
Karissa liked to measure the snowpack at her house. On Tuesday, the snowpack was 6 inches deep. On Wednesday,
2 1/2
inches had melted. How much snowpack was left by Thursday?
3 1/2
24.8 divide 3.2
7.75
40.4 ÷ (−5.8) ≈
-7
2/5+3/4
1 3/20
6/7 divide 2/5
2 1/7
The temperature of a cup of coffee changes –0.8 degrees for every minute it sits on the counter. If the overall temperature change of the coffee is –4.8 degrees, how many minutes has it been sitting on the counter?
6 Minutes