Additive Inverse
Which situations represent opposite numbers that when combined equal zero?
a. depositing $10 into a savings account and withdrawing $10 from that account
b. walking down one flight of stairs and then walking down another flight of stairs
c. driving north 20 miles and then driving east another 20 miles
a. depositing $10 into a savings account and withdrawing $10 from that account
Maria earns $100 from babysitting. She buys some earrings for $20.
What is a rational number showing the amount of money Maria now has?
100 + (-20)= 80
(-9) + (-7)
-16
Which situations represent opposite numbers that when combined equal zero?
a. making 2 cups of lemonade and then making another 2 cups of lemonade
b. the temperature drops 20F overnight and rises 20F by by noon
c. catching 2 flies and releasing 2 flies
b. and c.
At 3pm Alex walked 1.5 miles to the mall and at 4pm walked 1.5 miles back home.
What is a rational number representing the distance in miles Alex is from home at 4pm?
1.5 + (-1.5) = 0
14 + (-3) =
11
Which situations represent opposite numbers that when combined equal zero?
a. riding an elevator up 8 floors and then riding an elevator down 8 floors
b. adding 10 gallons of water to the pool and removing 10 gallons of water from the pool
c. digging 5 feet down and then digging another 5 feet down
a. and b.
Ella digs a hole 3 1/4 feet into the ground. The next day she digs another 5 feet into the ground.
What is the rational number which shows the change in depth of the ground
(-3 1/4) + (-5) = -8 1/4
(-2) + (-0.5) =
-2.5
11 gallons are drained out of a pool on Monday. Another 6 gallons are drained out on Tuesday.
What is the rational number which shows the total change in gallons of water in the pool?
(-11) + (-6) = -17
-9 + 1.5
-7.5
A whale dives 400 feet down. After hovering, the whale then dives another 300 feet down.
What is a rational number which represents the change in the whale's elevation?
(-400) + (-300) = -700
3 + (-5) + (-2) + 4 =
0