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Adding Integers Rules

Adding Integers Rules. Integer Addition Rules. Rule #1 – If the signs are the same, pretend the signs aren’t there. Add the numbers and then put the sign in front of your answer. 9 + 5 = 14. -9 + -5 = -14. Solve the Problems. -8. -3 + (-5) = 4 + 7 = 3 + 4 = -6 + (-7) =

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Adding Integers Rules

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  1. Adding Integers Rules

  2. Integer Addition Rules • Rule #1 – If the signs are the same, pretend the signs aren’t there. Add the numbers and then put the sign in front of your answer. 9 + 5 = 14 -9 + -5 = -14

  3. Solve the Problems -8 • -3 + (-5) = • 4 + 7 = • 3 + 4 = • -6 + (-7) = • 5 + 9 = • -9 + (-9) = 11 7 -13 14 -18

  4. Solve These Problems - += - -1 • - += • + = • - += + = 1 - += -

  5. -5 0 5 -10 10 Absolute Value -7 +7

  6. Absolute Value • The distance a number is from zero on the number line. Symbols: |2| = the absolute value of 2 Start at 0, count the jumps to 2. -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 It takes two jumps from 0 to 2. |2| = 2

  7. Absolute Value • The distance a number is from zero on the number line. Ex: |-4| = Start at 0, count the jumps to -4. -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 It takes four jumps from 0 to -4. |-4| = 4

  8. Absolute Value is ALWAYS positive because you are measuring distance.

  9. You try: Find the Absolute Value of the Integer 1. 2. 3. Answers 6 14 20

  10. Integer Addition Rules • Rule #2 – If the signs are different pretend the signs aren’t there. Subtract the smaller from the larger one and put the sign of the larger absolute value in front of your answer. -9 + 5 = 9 - 5 =4 Larger absolute Value Answer = - 4

  11. Solve These Problems 5 – 3 = 2 -2 • 3+ (-5) = • -4 + 7 = • 3+ (-4) = • -6+ 7 = • 5+ (-9) = • -9+ 9 = 3 7 – 4 = 3 -1 4 – 3 =1 7 – 6 = 1 1 -4 9 – 5 = 4 0 9 – 9 = 0

  12. Solve This Problem – = • - + = -=

  13. Solve This Problem = • += -=

  14. Solve This Problem – = • -2 + = – = -= = -

  15. Adding Integers • Same Sign – Add absolute values. Give answer with the sign that they have. • Different Signs – Subtract lesser absolute value from greater absolute value. Give answer the sign of the number with the greater absolute value.

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