Transcript 2.4,2.5 Positive and Negative Numbers

What should you do if you are
surrounded by 20 lions, 15 tigers
and 10 Leopards?
Just wait for the
merry go round to stop
and jump off.
Daffynition Decoder
Twin: Infant Replay
Carrot Juice: Hare Tonic
Male Surfer: Man Over Board
Adding Integers
Same Signs:
Add the two numbers and use the same
sign.
Different Signs:
Subtract the two numbers, use the sign of
the number with the larger absolute value.
Subtracting Integers
Rule:
To subtract an integer, add its opposite.
(Make two marks.)
Sections 2.4, 2.5
Multiplying and Dividing Integers
Rules for Multiplying Integers
Rules:
Positive x Positive = Positive
Positive x Negative = Negative
Negative x Positive = Negative
Negative x Negative = Positive
+•+=+
+•-=-•+=-•-=+
Find each product.
Find each product.
IF
And
Rules for Dividing Integers
Rules: Same as Multiplying
Positive ÷ Positive = Positive
Positive ÷ Negative = Negative
Negative ÷ Positive = Negative
Negative ÷ Negative = Positive
+÷+=+
+÷-=-÷+=-÷-=+
Divide.
Divide.
Find the average (mean) of
10, –12, 9, 15, –4, 0, –1, and 7.
Homework
Practice 2.4, 2.5 odds