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1300_Sec_12_in_class-filled

# 1300_Sec_12_in_class-filled - Multiply/divide absolute...

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Math 1300 Section 1.2 ° The number line: ° Absolute value: How far is this point from zero on the number line? Example 1: 15 Example 2: 8 - Example 3: 15 10 -

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° Comparing two numbers Three possibilities for two numbers, a and b . a is greater than b a is less than b a is equal to b < = a b a b a b Example 4: Form true sentences by inserting >, < or =. A. 0 7 - D. 8 9 - - G. 0.015 0.15 B. 4 5 E. 1 0.5 2 H. 1 0.12 8 C. 5 11 - F. 1 1 3 5 ° Operations with real numbers
Adding 2 numbers o Same signs? Add absolute values; keep the sign o Different signs? Subtract absolute values; take the sign of the number with the large absolute value Subtracting 2 numbers Rewrite as addition: ( - = + - a b a b . Then use rules for addition. Multiplying/dividing 2 numbers

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Unformatted text preview: Multiply/divide absolute values; answer is positive o Different signs? Multiplydivide absolute values; answer is negative Multiplying more than 2 numbers Multiply absolute values; even number of negative signs means the answer is positive. Odd number of negative signs means the answer is negative. Example 5: A. 8 ( 3) + -I. 4 ( 6)- + -Q. 6 ( 6) + -B. 14 75 17-+ J. 17 ( 25)-+ -R. 28 44 + C. 6 ( 10)- -K. 7 4- -S. 8 ( 3)- - -D. 79 114--L. 19 31-+ T. 22 ( 18) 4-- -+ E. 8 2-M. 15( 8)-U. ( 29 12 ( 10)--F. ( 29 ( 29 ( 29 14 27 0--N. 25 12 V. 97( 2)-G. ( 29 ( 29 4 4 5--O. ( 29 ( 29 ( 29 ( 29 2 3 4 5---W. 36 6-÷ H. 63 ( 9)-÷ -P. 72 8-X. 12...
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1300_Sec_12_in_class-filled - Multiply/divide absolute...

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