Add & Subtract Decimals
A researcher has three small containers of chemicals to use for an experiment. Container 1 has a mass of 0.43 gram. Container 2 has a mass of 1.562 grams. Container 3 has a mass of 0.4 gram. What is the total mass of the containers, in grams?
2.392 grams
Write a positive or negative number to represent each situation:
1.) you win $150 in a contest _________
2.) a loss of 15 yards in a football game _______
3.) 75 feet below sea level _________
4.) 35 degrees above 0 degrees F _________
5.) a debt of $24.75 __________
1.) $150 or +$150
2.) -15 yards
3.) -75 feet
4.) +35 or 35 degrees.
5.) -$24.75
ActivInspire #1
19
Three limes weigh 4.28 ounces, 4.82 ounces, and 2.85 ounces. What is the DIFFERENCE between the weights of the heaviest lime and the lightest lime?
1.97 ounces
The difference between two numbers is -3. Which of the expressions could represent the subtraction problem?
Choose ALL that apply.
A. -4 - 1
B. 8 - 11
C. 2 - (-1)
D. -1 - 2
E. -5 - (-2)
B, D, E
ActivInspire #2
2
Damien is training for a race. His goal is to run 5.5 miles over three days. So far, Damien has ran:
Day 1: 1.1 miles
Day 2: 2.17 miles
Day 3: 2.208 miles
Did Damien reach his goal? Fill in the blanks to complete the statement:
Damien ran a total of _______________ miles. The distance he ran over the three days is ______________ than his goal by _____________ mile(s).
5.478
less
0.022
In golf, scores that are under the expected score are represented by negative numbers. Calvin played three games of golf during a tournament. His score for each game is shown below.
Game 1: 1
Game 2: -3
Game 3: -2
PART A: Which statement is true about Calvin's score during the tournament?
A.) Calvin's score changed from Game 1 to Game 2 by -2.
B.) Calvin's score changed from Game 1 to Game 3 by -1.
C.) Calvin's score changed from Game 2 to Game 3 by -1.
D.) Calvin's score changed from Game 1 to Game 3 by -3.
PART B: What was Calvin's total score for the three games?
PART A: D
PART B: -4
ActivInspire #3
10
Sam is looking at cell phone plans. A local company offers a monthly plan for $58.95. The company is having a sale and offering a discount of $4.75 off the monthly plan. Sam says that the new cost is $11.45. Explain Sam's error and find the correct new cost.
Sam forgot to line up the decimal points when he subtracted $4.75 fro $58.95. The new cost is $54.20.
Solve the problem:
-8 - (-4) - 9
-13
ActivInspire #4
7
What is the value of 16.43 - 1.043?
15.387
Solve the problem:
-17 - (-19) - (-18) - (-1) - (-7) =
28
ActivInspire #5
33