Chapter 3 Lesson 2 Add Integers.

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Presentation transcript:

Chapter 3 Lesson 2 Add Integers

Vocab: opposites Integers like 2 and -2 are called _____________ because they are the same distance from 0, but on opposite sides. (additive inverses)

Add Integers with SAME sign _________ their absolute values… The sum is: Positive if both integers are ______________ Negative if both integers are _______________ Examples: 7 + 4 = 11 -7 + (-4) = -11 positive negative

Examples: Find -3 + (-2). -5 Start at 0 Move 3 units down -3 + (-2) = Start here at 0 -5

Another Example: -43 -26 + (-17) Both integers are _______________ so the sum is _______________. -43 negative negative

Your Turn  -5 + (-7) -10 + (-4) -14 + (-16) -12 -14 -30

Add integers with DIFFERENT signs Subtract _________ their absolute values… The sum is: Positive if the ____________ integer’s absolute value is greater. Negative if the ____________integer’s absolute value is greater. Examples: 9 + (-4) = 5 -9 + 4 = -5 Positives negatives

Examples: Find 5 + (-3). 2 Start at 0. Move right for positive integers. Move left for negative integers. 5 + (-3)= 2

Try on your own. 6 + (-7) -15 + 19 -1 4

More Examples: 7 + (-7) -8 + 3 2 + (-15) + (-2) -5 -15

Your turn…again! 10 + (-12) -13 + 18 (-14) + (-6) + 6 -2 5 -14

Word Problem A roller coaster starts at point A. It goes up 20 feet, down 32 feet, and then up 16 feet to point B. Write an addition sentence to find the height at point B in relation to point A. Then find the sum and explain its meaning. 20 + (-32) + 16 4

Exit Ticket -8 + (-4) + 12 -3 + 10

Homework Integer chip worksheet