8.12%作为分数

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  作为分数

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  Shane’s favorite store is having a blowout sale. The sign says everything is 60% off. He finds a jacket that was originally $150. What fraction of the price will he need to pay if he wants to buy it? How much is the jacket?
  ::Shane最喜爱的商店正在进行井喷销售。 牌子上写着每件东西都关闭了60 % 。 他找到了一件原本150美元的夹克。 如果他想买的话,他需要支付多少价格? 夹克多少钱?

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  In this concept, you will learn how to convert percents as fractions.
  ::在这个概念中,你会学习如何将百分数转换成分数。

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  Writing Percents as Fractions
  ::将百分比写入分数

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  Percents and fractions are parts of a whole. A  percentage  is a quantity out of 100. A fraction can also represent a quantity out of 100.
  ::百分数和分数是整体的一部分,一个百分比是100中的一部分,一个百分比是100中的一部分,一个分数也可以是100中的一部分。

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  Compare 44% and  $\begin{array}{r}\frac{44}{100}\end{array}$ .
  ::比较44%和44 100。

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  44% is 44 out of 100. The faction  $\begin{array}{r}\frac{44}{100}\end{array}$  also is the ratio of 44 out of 100. Both ratios compare the number 44 to 100.
  ::44%为100人中的44人,44人为100人中的44人,44人为100人中的100人,而44人为100人。

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  A percent can be converted to a fraction by writing the number over 100. The number is placed in the  numerator  and 100 is the  denominator .
  ::A%可以通过写入100以上数字转换成一个分数。 数字放在分子中,100是分母。

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  Let’s look at 7%. 7 percent is the ratio of 7 out of 100.
  ::让我们看看7%。 7%是100人中7人的比例。

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  First, remember that a percent is written as a quantity over 100.
  ::首先,记住1%是100以上的数量。

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  Then, write 7 in the numerator and 100 in the denominator.
  ::然后在分子数中写7,在分母中写100。

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  7% is written as  $\begin{array}{r}\frac{7}{100}\end{array}$ .
  ::7%的书写为7 100。

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  Examples
  ::实例

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  Example 1
  ::例1

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  Earlier, you were given a problem about Shane at the blowout sale.
  ::早些时候 Shane在井喷销售会上 给了你一个问题

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  He wants a $150 jacket that is 60% off. To find the fraction of the price he needs to pay, he has to first fine the percentage he needs to pay and convert it to a fraction.
  ::他想要一件150美元的夹克,这是60 % 的关闭。 为了找到他需要支付的价格的一小部分,他必须首先罚款他需要支付的百分比,然后将其转换成一个部分。

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  First, find the percentage that he needs to pay. Subtract 60% from 100%.
  ::首先,找出他需要支付的百分比,从100%中减去60%。

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  Then, convert 40% to a fraction. 40% is the same as 40 out of 100. The numerator is 40 and the denominator is 100.
  ::然后,将40%转换成一个分数。 40%与100分之40相同。 分子为40,分母为100。

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  If Shane wants to buy the jacket, he will need to pay  $\begin{array}{r}\frac{40}{100}\end{array}$  of the original price. To find the sale price, multiply the original price by the fraction  $\begin{array}{r}\frac{40}{100}\end{array}$ .
  ::如果Shane想买这件夹克,他需要支付40100元的原价。要找到销售价格,将原价乘以40100分数。

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  But first, look at the fraction  $\begin{array}{r}\frac{40}{100}\end{array}$ . It can be simplified by dividing the numerator and denominator by 20 to find an equivalent ratio that is easier to multiply. Remember,   have the same value.
  ::但首先,请看40100分数。它可以通过将分子和分母除以20来简化,以找到一个比较容易乘的等值比例。记住,具有相同的值。

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  Now, find the sale price. Multiply the original price by  $\begin{array}{r}\frac{2}{5}\end{array}$ .
  ::现在,找到销售价格。乘以原来的价格乘以25。

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  The sale price of the jacket is $60.
  ::夹克的销售价是60美元

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  Example 2
  ::例2

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  Write 95% as a fraction.
  ::将95%的分数写成一个分数。

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  First, think of 95% as “95 out of 100.” 95 is the part out of 100.
  ::首先,95%被认为是“100人中的95人”。 95人就是100人中的部分。

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  Then, write 95 as the numerator over the denominator 100.
  ::然后,写95作为分母100上的分子数。

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  95% is written as  $\begin{array}{r}\frac{95}{100}\end{array}$ .
  ::95%的书写为95 100。

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  Write the following percents as a fraction.
  ::将以下百分比作为分数写入 。

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  Example 3
  ::例3

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  Write 68% as a fraction.
  ::将68%作为一个分数写出来。

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  First, think of 68% as “68 out of 100.” 68 is the part out of 100.
  ::首先,将68%视为“100人中的68人”。 68人占100人中的68%。

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  Then, write 68 as the numerator over the denominator 100.
  ::然后,写68作为分母100上的分子数。

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  68% is written as  $\begin{array}{r}\frac{68}{100}\end{array}$ .
  ::68%的写法是68 100。

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  Example 4
  ::例4

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  Write 13% as a fraction.
  ::将13%作为一个分数写出来。

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  First, think of 13% as “13 out of 100.” 13 is the part out of 100.
  ::首先,13%被认为是“100分中的13分”。 13分是100分中的13分。

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  Then, write 13 as the numerator over the denominator 100.
  ::然后写13作为分母100上的分子数。

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  13% is written as  $\begin{array}{r}\frac{13}{100}\end{array}$ .
  ::13%的写法是13 100。

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  Example 5
  ::例5

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  Write 21% as a fraction.
  ::将21%作为一个分数写出来。

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  First, think of 21% as “21 out of 100.” 21 is the part out of 100.
  ::首先,21%被认为是“100分中的21分”。 21分是100分中的21分。

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  Then, write 21 as the numerator over the denominator 100.
  ::然后,写21作为分母100上的分子数。

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  21% is written as  $\begin{array}{r}\frac{21}{100}\end{array}$ .
  ::21%写为21 100。

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  Review
  ::回顾

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  Write the following percents as a fraction.
  ::将以下百分比作为分数写入 。

  1. 54%
  2. 11%
  3. 6%
  4. 12%
  5. 89%
  6. 83%
  7. 19%
  8. 4%
  9. 9%
  10. 18%
  11. 89%
  12. 100%
  13. 23%
  14. 77%
  15. 98%
  16. 2%

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  Review (Answers) 
  ::回顾(答复)

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  Click   to see the answer key or go to the Table of Contents and click on the Answer Key under the 'Other Versions' option.
  ::单击可查看答题键, 或转到目录中, 单击“ 其他版本” 选项下的答题键 。

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  Resources
  ::资源