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Big Ideas Math: Modeling Real Life, Grade 7
BI
Big Ideas Math: Modeling Real Life, Grade 7 View details
4. Multiplying Rational Numbers
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Exercise 1 Page 68

Multiply as though they were both whole numbers. Place the decimal point in the product by counting the number of decimal places in each factor.

- 9.18

Practice makes perfect
When multiplying real numbers, the product will be positive if the signs are the same and it will be negative if the signs are different. cc Same Sign & Different Signs (+)(+)=(+) & (+)(-)=(-) (-)(-)=(+) & (-)(+)=(-)In our case one number is positive and one number is negative, so the product will be negative. To find the product, we multiply just as we do with two whole numbers. At first, we ignore any decimal points.
Apple to multiply two natural numbers
Then we place the decimal point in the product by counting the number of decimal places in each factor.
multiplication
The product of - 5.1 and 1.8 is - 9.18.
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arrow_right Try It p.68-69
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Try It 2 (Page 68)
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arrow_right Self-Assessment for Concept & Skills p.69
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Self-Assessment for Concept & Skills 8 (Page 69)
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arrow_right Self-Assessment for Problem Solving p.70
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arrow_right Review & Refresh p.71
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arrow_right Concept, Skills, & Problem Solving p.71-72
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