Adding Integers
The Opposite of -120
What is 120?
If I borrowed 27 dollars from Mido, and I payed her back 12, what is the integer that represents my current debt?
-27 + 12 = -15 Dollars
What is Mrs. Clifford's dog's name?
Kevin
Is 7.25 a rational number?
Yes, it is a terminating decimal.
What two types of Decimals are included in the rational number system?
Repeating and Terminating
Write as addition: -7-10=
What is -7+(-10)
What is -1/2
A submarine is 48 meters below the water surface. The submarine then rises 15 meters. What integer represents the submarine’s final position with respect to the surface of the water?
Write an equation and answer.
-48 + 15 = -33
How do you add integers with the same sign?
Same sign: Find the Sum; keep the sign
Write as addition: 12-(-19)
What is 12+ (19)
The distance a number is from zero.
What is Absolute Value?
The temperature in the late afternoon was −7.5°C. It dropped 5 degrees by early evening and then dropped another 8.5 degrees by midnight. What was the temperature at midnight?
Write an equation and answer
-7.5 + (-5) + (-8.5) = -21
How do you add different signed integers?
25 - (-12) - 2
What is 35?
Also called the Additive Inverse
What is an Opposite?
The floor of an elevator in a building is 25.5 feet above ground level. It travels down to the lower level of the building, where the floor is 10 feet below ground level. What distance has the elevator traveled?
25.5-(-10)= 35.5 Feet