Chapter 1.2 DO: We will add and subtract integers.

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Presentation transcript:

Chapter 1.2 DO: We will add and subtract integers.

Activity: Think about it... A football running back gains 8 yards then loses 10 yards. Is the end yardage greater than or less than the starting yardage?

Negatives and subtraction signs are the same thing What’s the Big Idea? Integers: positive and negative numbers, not including typical fractions or decimals Negatives and subtraction signs are the same thing Vid - Integers Club by Shmoop

Activity: Integer Counters -3+2 Click Here Integer Counters Click Here Integers Number Line

How to add and subtract integers: Simplify the signs What’s the Big Idea? How to add and subtract integers: Simplify the signs + + simplifies to + - - simplifies to + + - simplifies to - Combine integers (use a t-chart) Double-check that you have the correct positive or negative sign

Here’s how… 7+13 -8+(-5) -20+(-5) -3+7 3-12 -8-(-13) 5-(-4)

You try… 9+(-11) -3+(-1) 0-(-11) -5+12 -4-6 -7-(-8) 30-(-6)

Real Life Application A shark is at -80 ft. It swims up and jumps out of the water to a height of 15 ft. Write and simplify an expression for the vertical distance the shark travels.

The figure shows a diver Real Life Application The figure shows a diver diving from a platform. The diver reaches a depth of 4 meters. What is the change in elevation of the diver?

Check ✓ Explain how you add or subtract integers (aka combine integers).

Describe and correct the error! 7-(-12)=-5 -10+(-10)=0 Errors! Fix them! Describe and correct the error! 7-(-12)=-5 -10+(-10)=0

Activity: Human Number Line Click Here XP Math - Integers Addition Click Here XP Math - Integers Subtraction

Become a Master at what you just learned. Record and Practice Workbook (RP) Pg. 10 & 14 evens XPmath.com - Score of 30 or higher with NO errors on “Integers Addition -9 to +9” & “Integers Subtraction -9 to +9” (photo)