Ratio and Percentage

Ratio and Percentage has 6 subtopics:

1. Ratio and Proportion: this topic teach you how to find the ratio between two numbers, and what proportion means.

2. Unit Rate: this help you answer the question “How much/ how many per …” or “... for one/ a(n) ...” . For example: 50 kilometer per hour, $2 per pound, or $1.99 for a box of 20 pens.

3. Solving proportion by cross multiplying: shows you how to find two equivalent ratios. Example: 2 out 5 is the same as what number out of 20, or 2 tickets cost $3 how much does 7 tickets

4. Percent: here we learn how to find the percent of number. For example: what is 4% of 45 or 3 is what percent of 5.

5. Increase and decrease percentage: this section will show you find the price of something after increase or decrease. Example: An owner sell his house at $180,000 after decrease 10%. Find the original price.

6. Convert between Percent, Decimal, Fraction: we will learn how to convert between those type of number. Example: convert 3/7 into percent or 45% into decimal.

</div> <div jsname="WJz9Hc" style="display:none">比和比例有6个副主题：

     1.比和比例：本主题教你如何找到两个数字之间的比率，什么意思比例。

     2.单位费率：本帮助你回答这个问题：“有多少/多少元...”或“......一/ A（N）...”。例如：每小时50千米，2元一斤，或1.99美元一箱20笔。

     3.解决比例交叉相乘：显示你如何找到两个相等的比率。例如：2 5相同什么号码出20，或者2票花费30多少门票7

     4.百分比：在这里我们学习如何找到数的百分比。例如：什么是45或3 4％5％的东西。

     5.增减百分比：本节会告诉你找到的东西的价格上升或下降后。例如：一个所有者下降10％后出售他的房子为180 000美元。找到原来的价格。

     6.百分比，小数，分数之间的转换：我们将学习如何与这些类型号的转换。例如：转换成3/7或百分之45％到小数。</div> <div class="show-more-end">