4Negative Numbers Are Used to Measure Under Sea Level 302010-10-20-30-40-50
5Negative Numbers Are Used to Show Debt Let’s say your parents bought a car but had to get a loan from the bank for $15,000.When counting all their money they add in-$ to show they still owe the bank.
6INTRODUCTION TO INTEGERS We can represent integers using red and yellow counters.Red tiles will represent negative integers, and yellow tiles will represent positive integers.Negative integerPositive integer
7INTRODUCTION TO INTEGERS The diagrams below show 2 ways to represent -3.Represent -3 in 2 more ways.-3-3
8INTRODUCTION TO INTEGERS You may represent -3 by using 3 red tiles and any number of groups of +1 and -1 tiles
9INTRODUCTION TO INTEGERS Tell which integer each group of tiles represents.+1-2+2
10INTRODUCTION TO INTEGERS Tell which integer each group of tiles represents.-1-4+4
11INTRODUCTION TO INTEGERS Tell which integer each group of tiles represents.+5-4-3
12INTRODUCTION TO INTEGERS If there are the same number of red tiles as yellow tiles, what number is represented?It represents 0.
13Zero Pairs -3 + 4 = 6 – 10 = Zero Bank -6 + -7 = 12 + -7 = -3 – (-4) = 5 – (-9) =Zero BankTo use zero bank get out of slide show!
14On your own -4 + 4 = -6 – 15 = Zero Bank -6 + 13 = 2 + -13 = -4 – (-4) =-9 – (-9) =Zero Bank