Integers

We have the Yellow Team and the Red Team…. Assign the left side of the room to the red team and right side to the yellow team.

Who is favored & by how much if we have…

So…how can I represent: -7 + 3 Start with: Which Leaves: Add 3:

Use the counters…. A: -2

Use the counters…. -7

Use the counters…. 1

Use the counters…. -4

Use the counters…. -3

Use the counters…. -50

Use the counters…. -390

So…How do I add signed numbers?

Can you make a rule for this? Same Signs Add the numbers Take their sign Different Signs Subtract the numbers Take the sign of the number with largest absolute value

Opposites: The opposite of 5 is -5. What is –(-2)? A: 2

Use the counters…. Same as 3 + 2! A: 5

Use the counters…. Same as -12 + 20 A: 8

Do the following: 1 9 – 8 = -6 – (-9)= -14 + 3 = 10 – 19 = 3 -11 -9

Do the following: 29 - 32 = -82 – 12 = -45 + 78 = 16- (-27) = -3

What’s 4 x -3? =

Let’s Multiply: -10

Let’s Multiply: -6

So…How do I explain -3 x -4? I like to think of this as – (3 x -4) and think of it as the opposite of (3 x -4). Can you develop a rule for Multiplication?

Let’s Multiply: 6

So…what’s the rule for multiplying integers?

Division:

Divide:

So..what’s the rule for Dividing integers

Multiplying & Dividing: Like signs – positive Unlike signs - Negative

Homework Worksheet