 # Multiplying Integers.

## Presentation on theme: "Multiplying Integers."— Presentation transcript:

Multiplying Integers

Multiplying Integers Let’s model integer multiplication: 2 • -3 = -6
-6 • 5 = -30

Multiplying Integers So, a positive number times a negative number is a ________ number. Negative And, a negative number times a positive number is a ________ number. What is the answer to a negative times a negative?

Multiplying Integers Look at the pattern: -2 • 3 = -6 -2 • 2 = -4
-2 • 1 = -2 -2 • 0 = 0 -2 • -1 = ?? What is happening to the product each time? It is increasing by 2 -2 • -1 = which is 2

Multiplying Integers A negative number times a negative number is a ________ number Positive

Multiplying Integers Here is a way to remember it:
Good guys are +, Bad guys are – Coming into town is +, Leaving Town is – Good is +, Bad is - If a good guy (+) comes into town (+), that’s good (+) If a good guy (+) leaves town (-), that’s bad (-) If a bad guy (-) comes into town (+), that’s bad (-) If a bad guy (-) leaves town (-), that’s good (+)

Multiplying Integers Multiply: 4(-3) -12 -2 • -9 18 (-25)(6) -150
-7 • -32 224 12(10) 120 -16(-5) 80

The Integer Song Verse 4 Here is a rule that you must know when multiplying integers, If signs are the same The answer’s always positive.

The Integer Song Verse 5 Another rule that you must know when multiplying integers, If signs are different The answer’s always negative.