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1300_section1o2 - 5-17-25 6 28 44 7 6 –-10 8-7 – 4 9-8...

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1 1.2 Integers Absolute Value : The absolute value of a real number is its distance from 0 on the number line. The numbers 2 and -2 are both 2 units away from 0. That is, 2 2 = and 2 2 = - . The absolute value of a real number is never negative! Examples: = 5 = - 5 = 2 . 1 = - 5 . 2 = 0 Operations with integers: Adding Integers: o Same signs – add and keep the sign o Different signs – subtract their absolute values and take the sign of the number with the larger absolute value Subtracting Integers: o Change the problem to addition using these rules: b a b a b a b a b a b a b a b a + - = - - - - + - = - - + = - - - = - ) ( ) ( ) ( ) ( o Use the rules for adding integers (above) Examples: Perform the following operations: 1. 8 + (-3) 2. 6 + (-6) 3. -4 + (-6) 4. 14 – 75
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Unformatted text preview: 5. -17 + (-25) 6. 28 + 44 7. 6 – (-10) 8. -7 – 4 9. -8 – (-3) 10. -79 – 114 11. -197 – 216 12. -22 + 4 2 Multiplying and Dividing Integers: o Multiply or divide “normally” o If multiplying/dividing two numbers – same signs means positive answer, different signs means negative answer o For more than two numbers – even number of negative signs means the answer is positive, odd number of negative signs means a negative answer Examples: Perform the following operations: 1. -8(2) 2. 15(-8) 3. -12(-10) 4. (-14)(-27)(0) 5. 25(12) 6. 97(-3) 7. 4(-4)(-5) 8. -2(-3)(-4)(-5) 9. -36 ÷ 6 10. -63 ÷ (-9) 11. 0 ÷ 5 12. -72 ÷ 9...
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