0-3 Addition and Subtraction with Integers Goals: Add and subtract integers Use addition and subtraction to solve real life problems *

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Presentation transcript:

0-3 Addition and Subtraction with Integers Goals: Add and subtract integers Use addition and subtraction to solve real life problems *

Vocabulary Opposites – two points that are the same distance from zero. Absolute Value – distance from zero (never negative)

Opposites Find the opposite of each number:

Absolute value Find the absolute value of each number:

Rules of Addition Same sign (both positive or both negative) ▫Add the absolute value of the two numbers and keep the sign  EX: = -7 Different sign (one positive, one negative) ▫Subtract the number with the smaller absolute value from the number with the larger absolute value, and use the sign of the number with the larger absolute value.  EX: 7 + (-3) = = -3

Examples (-6) (-8) (-6) (-2) (-2) = 3 = -4 = -12 = -4 = 6 = 0

Subtraction Rule Add the opposite: ▫5 – 3 means 5 + (-3) = 2 ▫-6 – 8 means -6 + (-8) = -14 ▫10 – (-13) means = 23 ▫-16 – (-9) means = -7

Examples 1.-4 – – – – (-6) – – (-13) = -7 = -1 = 6 = 4 = -37 = 38

Examples 1.3 – (-4) – – – (-18) 3.-5 – (-3) + 4 – – (-3) – 6 = 13 = 37 = 1 = -1

Practice Worksheet “0-3 Adding and Subtracting Integers”

Word Problem #1 You are in a submarine that is 500 feet below the surface of the water. You go down 150 more feet. What is your current depth? -650 feet

Word Problem #2 You borrowed $10 from your uncle. You paid him back $5. How much money do you owe now? $5

Homework Page P12 #1-9, 19, 20, 23