Rules of Integers
What is the rule for adding a POSITIVE + NEGATIVE?
Subtract the numbers and take the sign of the greater absolute value
22 + (-19) =
3
-7 - 4 =
-11
Jayce scores 30 points in a video game. His little brother scores 1/3 of Jayce's score. What is the little brothers score?
30 x 1/3 = 10
A whale is 40 meters below sea level. She swims up 35 feet to eat krill. At what elevation does she eat?
-40 + 35 =
When subtracting, you can change the problem to an addition problem by...
(Subtracting is the same as ... the ...)
Subtracting is the same as adding the opposite.
-16 + (-50) =
-66
70 - (-70) =
140
Jack owes his friends 100 dollars. He has 4 friends. How much money does he owe each friend?
-100 / 4 = -25
In a contest, Jordan's team earns 60 points. In the second round they lose 100 points. How many points do they have after the second round?
60 + (-100)
OR
60 - 100
What is the rule for multiplying a NEGATIVE times A NEGATIVE
NEGATIVE X NEGATIVE = POSITIVE
-4 + 7 =
3
18 - 6 -12 =
-36
A submarine starts at sea level. It drops at a speed of 25.60 feet per minute for 12 minutes. What elevation does it drop to?
-307.2 feet
The temperature at the top of Mt. Everest at night is -60 degrees. During the day it warms up buy 33 degrees. What is the temperature during the day?
-60 + 33
What is the rule for multiplying a POSITIVE times A NEGATIVE
A POSITIVE time a NEGATIVE is a NEGATIVE
80 + (-60) =
20
-60 - (-90) =
30
A monkey climbs up a large tree. He stops every 5 seconds to pick a bug out of his hair. If he is 75.5m above the ground, how many bugs does he find in his hair on the way up?
On a cave dive, Maria sees a sea turtle -20 feet below sea level. Then, she sees a dolphin -15 feet below sea level. How far away is the dolphin from the sea turtle?
-20 + (-15)
OR
-20 - 15
A POSITIVE divided by a NEGATIVE is a NEGATIVE
15 + (-16) + 20 =
19
(-20) - 20 - 15 - (-15) =
-40
Jonathan is 5.4 feet tall. His little sister is 1/4 his height. How tall is his sister?
1.35 feet tall
Santa is 400 dollars in debt after the elves quit and he had to buy more toys for the children. He is charged $210 by the bank of Rudolph. How much debt is he in now?
-400 + 210