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Multiplying and Dividing Rational Numbers

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Multiplying and Dividing Rational Numbers

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All the rules and procedures in one place! Thanks to Mrs. Angell for this great reference.

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When do we need to multiply negative fractions and decimals?

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When do we need to multiply negative fractions and decimals?

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1. A temperature decrease would be represented by a negative decimal like a drop of 1.6 degrees. If that was the drop every hour, we could multiply -1.6 times the number of hours.

2. Next year and in Algebra 1 you will learn about the slope of a line. The line's slope (or slantyness) will be measured as a fraction (rise over run) and it will frequently be negative! There will be problems that require you to multiply the slope by the x coordinate to find the y coordinate.

3. Debts are represented with negative numbers, and they are frequently decimals like -$25.89

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How to Cross Cancel Fractions that are being Multiplied

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How to Cross Cancel Fractions that are being Multiplied

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Basically, this is simplifying the fractions before you mutliply. Dividing a common factor out of the numerator and denominator.

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Math 7A Unit 3 Lesson 2 Multiply Fractions and Decimals

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Math 7A Unit 3 Lesson 6 Dividing Rational Numbers