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Published byDaniella Nicholson Modified over 8 years ago

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Adding and Subtracting Integers

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RULE #1: Same Signs!! When you’re adding two numbers with the same sign, just ignore the signs! Add them like normal! Just don’t forget to put the sign with your answer…. Examples: 9 + 5 = 14 (-9) + (-5) = -14 The 14 is positive because both numbers are positive!! The 14 is negative because both numbers are negative!!

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EXAMPLES!!!!!! -3 + (-5) = 4 + 7 = 3 + 4 = -6 + (-7) = 5 + 9 = -9 + (-9) = -8 11 7 -13 14 -18

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RULE #2: Different Signs When the signs are different, just ignore the signs. Subtract like you would normally (bigger number first)… THEN put the sign of the bigger number with the answer! KEVIN VS. KEVIN Examples: (-9) + 5 Subtract! 9 – 5 = 4 9 is negative so the answer is negative! -4

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Don’t be grumpy! Just try! 3+ (-5) = -4 + 7 = 3+ (-4) = -6+ 7 = 5+ (-9) = -9+ 9 = 5 – 3 = 2 9 – 9 = 0 9 – 5 = 4 7 – 6 = 1 4 – 3 =1 7 – 4 = 3 -2 0 -4 1 3 -2 0 -4 1 3 -2 0 -4 1 3 -2 0 -4 1 3 -2 0 -4 1 3 -2 3 1 -4 0

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KEEP RULE #3: Instead of subtracting, we are going to be adding the opposite number. In other words… CHANGE 4 – (-6) = (-2) – 8 = (-7) – (-5) = 4 + (+6) = (-2) + (-8) = (-7) + (+5) = 10 -10 -2 Follow Regular Addition Rules! Examples:

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Time for Homework….

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