## Reflection: Real World Applications Adding and Subtracting Integers on a Number Line - Section 1: Do Now

Students were able to order the amounts of money relatively easily.  A student was able to explain that -20 is less than -5, because it is further to the left on the number line.  I asked students how Terriana could have a negative balance.  One student said that she spent all of her money.  I said that if I had \$20 and spent all of my money, I would be left with \$0.  I had students quickly participate in a Think Pair Share.  Then a few students shared that if she had a negative balance, she spent more money than she had in her bank account.  I explained that if you spend more in your account, that it is called over drafting.  The bank covers the purchase, and you owe the bank the money.  I then explained overdraft fees.  As student declared, “That should be illegal!”  I explained that banks are businesses and overdraft fees are one way they make money.  It is very important to keep track of your balance.

How can her balance be negative?
Real World Applications: How can her balance be negative?

# Adding and Subtracting Integers on a Number Line

Unit 3: Integers and Rational Numbers
Lesson 5 of 17

## Big Idea: What happens when you add positive 5 and negative 3? What happens when you subtract positive 2 from negative 3? Students work with a number line and football to model adding and subtracting integers.

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Standards:
Subject(s):
Math, Integers, Number Sense and Operations, number line, 6th grade, master teacher project, adding integers, subtracting integers
60 minutes

### Andrea Palmer

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