Big Ideas Math: Modeling Real Life, Grade 8
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Big Ideas Math: Modeling Real Life, Grade 8 View details
Chapter Review
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Exercise 18 Page 418

Write the mixed number as a fraction and divide the numerator by the denominator.

- 2.83

Practice makes perfect
We want to write the mixed number as a decimal. -2 56 To do so, we first rewrite it as a fraction. We ignore the negative sign for just a moment.
2 56
â–Ľ
Rewrite 2 56 as 17/6
2* 6+5/6
12+5/6
17/6
Now, we know that we can write 2 56 as 17 6. We divide the numerator by the denominator to calculate the fraction. Let's do it!
We can see that the pattern starts to repeat itself after a few steps. This means that the decimal is a repeating decimal. We can write it with a bar notation. Remember that the bar goes over the decimal part that repeats itself. 2.833333... = 2.83 This means that we can write 176 as 2.83. We also know that 2 56 is equal to 176. Therefore we can write 2 56 as 2.83. Now we add the negative sign and see that - 2 56 is equal to - 2.83.