Concepts
What is the additive Inverse?
The opposite of the number. What you add to the number to bring the value to 0.
What is the additive inverse of -23 3/4 written as a decimal?
23.75
A helicopter is flying 200 ππ‘ above the ocean. It is directly above submarine that is 90 ππ‘ below sea level. Which expression could be used to calculate how far apart the helicopter is from the submarine?
|200 - (-90)|
Ingvar is playing a video game that takes away points for losing treasures. His current score is -56.2, and then he loses a treasure worth 27.7 points. Write an expression and show his score.
-56.2 - 27.2 = -83.9
Describe a situation in which oppposite quantities combine to make 0.
varies
What symbol represents absolute value?
| |
Which situation represents the expression -10 + 10? Circle the letter of the correct answer.
A. Xander hikes 10 feet up a mountain and then comes back down.
B. Julia borrowed $10 from me and then paid me back.
C. Yolanda added 10 coins to a jar that already contained 10 coins.
B
| -1/2 - (-5) |
4 1/2 or 4.5
The temperature in Canada is β2.1Β°πΆ while the temperature in the Bahamas is 38.8Β°πΆ. How many degrees apart are the temperatures?
40.9 degrees
Savana walks 3 1/2 miles to the local park. On her way home, she stops at Randolphβs house after 1 2/3 miles to pick up a book. Write and evaluate a subtraction expression to find how much farther Savana must walk to get home. Use decimals and estimate.
3.5 - 1.67 = 1.67 miles
a ratio is a....
fraction that can be writte as a decimal too!
β1/2 + 5/7 + 1/2 + (β5/7)
0
On the number line below, x and y are the same distance from 0. If x is positioned at 4, place y in its correct place on the number line. x + y = ?
X ______________________________________
-5 -4 -3 -2 -1 0 1 2 3 4 5
-4, 0.
Malik earns an average of 4 1/2 points on his daily quizzes. Near the end of the quarter, his average decreases by 3/4 point. Write and evaluate a subtraction expression to find his current quiz grade average.
4 1/2 - 3/4 = 3 3/4 points
An architect plans a courtyard with a width of 16.4 yards, then learns its width must change by -2.3 yards. Write an expression and show the new width?
16.4 + (-2.3) = 14.1 yards
What is absolute value?
The distance from zero.
Which expressions show a sum of 7?
A. -7 + 7
B. 15.2 + (8.2)
C. β3 1/2 + 10 1/2
D. β13.9 + 6.9
E. β1+8
C, E
Julio's football team gained 5 yards from their starting position on their first play. On the second play, his team lost 12 yards. On the third play, the team gained 9 yards. Is the team at their starting position?
No they are at 2.
Jayvon has 33.6 points in a competition. He loses 5.5 points. Write and evaluate an addition expression to determine Jayvonβs current points.
33.6 + (-5.5) = 28.1
Mr. Leander bought two shirts for a total of $46.72. He returned one of the shirts for a refund of $24.61. Write and evaluate an addition expression to show what Mr. Leander paid for the shirt he kept
46.72 + (-24.61) = $22.11
A football team loses 3.5 yards on their first play. On the next play, they gain 3 1/2 yards. What is the overall increase or decrease in yards ?
0
Joseph removes 5/8 gallon of white paint from a can. Then he adds 5/8 gallon of blue paint to the can. Write and evaluate an addition expression to find the overall increase or decrease in the amount of paint in the can.
-5/8 + 5/8 = 0
A bird is flying 23 ππ‘ above sea level while a dolphin follows the bird from 5 ππ‘ below sea level. Write an equation to reflect the distance between the bird and the dolphin?
|23 - (-5)| = 28 feet apart
Scientists are studying the effects of increased temperature, which causes bleaching on coral reefs. A scientist dives at two different reefs, one located 34 1/2 feet below sea level and one at 26 1/4 feet below sea level. Write and evaluate a subtraction expression to find the change in elevation needed in order for the diver to reach the deeper reef.
34 1/2 - 26 1/4 = 8 1/4
or -8 1/4 because diver is descending.
Brock rides a bike 22 1/8 miles to the nature preserve. On his way home, after 16 1/5 miles, he stops for lunch. How far is Brock from home? Write and evaluate an addition expression to solve the problem.
22 1/8 + (-16 1/5) = 5 37/40 = 5.925 miles away from home