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Big Ideas Math: Modeling Real Life, Grade 7

BI

Big Ideas Math: Modeling Real Life, Grade 7 View details

5. Dividing Rational Numbers

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Exercise 1 Page 77

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.

- 0.655

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 negative and one number is positive, so the product will be negative.

- 0.5(1.31)

(- a)b = - ab

- (0.5* 1.31)

To find the product, we multiply just as we do with two whole numbers. At first, we ignore any decimal points.

multiplication

Then we place the decimal point in the product by counting the number of decimal places in each factor.

multiplication

The product of 0.5 and 1.31 is 0.655. This means that the product of - 0.5 and 1.31 is - 0.655.

Subchapter links

Try It p.74-75

Self-Assessment for Concept & Skills p.75

Self-Assessment for Problem Solving p.76

Review & Refresh p.77

Concept, Skills, & Problem Solving p.77-78