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Published byPeregrine Douglas Modified over 9 years ago
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POD #2 BasicAdvanced I-45I +5 I-4I +15 + I-12I 50 31
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Add Integers Integers like 2 and -2 are called opposites because they are the same distance from 0, but on opposite sides.
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Two integers that are opposites are also called additive inverses. The Additive Inverse Property states the sum of any number and its additive inverse is zero. So, 2 +(-2) = 0
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To add integers with the same sign, add their absolute values. The sum is: Positive if both integers are positive Negative if both integers are negative Examples: 7+4=11 -7+(-4)= -11
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To add integers with the different signs, subtract their absolute values. The sum is: Positive if the positive integer’s absolute value is greater. Negative if the negative integer’s absolute value is greater. Examples: 9+(-4)=5 -9+ 4= -5
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Whiteboard time 5 + (-3) =2 -3 + -2 = -15 + 19 =4 -5
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(-12) + (-4) + (-3) =-19 (-80) + 30 + (-20)= 11 + (-29) =-18 -70
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Write an addition expression to describe each situation, then find the sum: Cole receives $40 for his birthday. Then he spends $15 at the movies. Write an addition expression to describe each situation: 40 + (-15)= 25; Cole now has $25.
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Write an addition expression to describe each situation, then find the sum: Sam Bradford is sacked for a loss of 5 yards. On the next play the team loses 15 yards. Then they gain 12 yards on the third play. Write an addition expression to describe each situation: -5 + (-15) + 12 = -8; The Eagles lost a total of 8 yards.
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