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Big Ideas Math: Modeling Real Life, Grade 8

BI

Big Ideas Math: Modeling Real Life, Grade 8 View details

4. Rational Numbers

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Exercise 15 Page 399

Start by writing the given mixed number as a fraction. Then, divide the numerator by the denominator.

- 2.38

Practice makes perfect

We want to write the given mixed number as a decimal number. - 2 718 To do so, we will ignore the negative sign for just a moment. We will first rewrite 2 718 as a fraction.

2 718

▼

Rewrite 2 718 as 43/18

a bc=a* c+b/c

2 * 18 + 7/18

Multiply

36 + 7/18

Add terms

43/18

We found that 2 718 written as a fraction is 43 18. Recall that this means 43÷ 18. Therefore, we will divide the numerator of this fraction by its denominator. Let's do it!

We found that 4318 written as a decimal is 2.38. Since we previously found that 2 718 is equal to 4318, we can say that 2 718 written as a decimal is 2.38. Do not forget about the negative sign. - 2 718 = - 2.38

Subchapter links

Try It p.396-397

Self-Assessment for Concepts & Skills p.397-398

Review & Refresh p.399

Concepts, Skills, & Problem Solving p.399-400