0-5: Multiply and Dividing Rational Numbers

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Multiplying and Dividing Rational Numbers

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Presentation transcript:

0-5: Multiply and Dividing Rational Numbers

0-5: Multiplying/Dividing Rational Numbers The rules about multiplying/dividing integers (covered yesterday) are the same for multiplying/dividing all rational numbers Multiplying with the same sign yields a positive answer Multiplying with different signs yields a negative answer Find each product or quotient 7.2(-0.2) -1.44 -23.94 ÷ (-10.5) 2.28

0-5: Multiplying/Dividing Rational Numbers To multiply fractions, multiply numerators with numerators and denominators with denominators. Reduce when possible Convert mixed numbers into improper fractions

0-5: Multiplying/Dividing Rational Numbers Two numbers whose product is 1 are called multiplicative inverses or reciprocals Simply flip the fraction Find the reciprocal of each fraction 3/8 8/3 2 4/5 Convert to an improper fraction: 14/5 5/14

0-5: Multiplying/Dividing Rational Numbers To divide one fraction by another, flip the division into multiplication, and flip the fraction that came after the division sign. 1/3 ÷ 1/2 = 1/3 ● 2/1 = 2/3 3/8 ÷ 2/3 9/16 3/4 ÷ 21/2 3/10 -1/5 ÷ (-3/10) 2/3

0-5: Multiplying/Dividing Rational Numbers Assignment Page P19 1 – 41 (odds)