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SAT2数学考试题目:Percents

2019-09-04 15:23:00来源:网络

  为了帮助大家高效备考SAT,新东方在线SAT频道为大家带来SAT2数学考试题目:Percents,希望对大家SAT备考有所帮助。更多精彩尽请关注新东方在线SAT频道!

  A percent is another way to describe a part of a whole (which means that percents are also another way to talk about fractions or decimals). Percent literally means “of 100” in Latin, so when you attend school 25 percent of the time, that means you only go to school 25/ 100 of the time (or .25).

  You would probably fail all your classes if your attendance percentage was that low, so don’t get any ideas from our example. Instead, take a look at this question: 3 is what percent of 15?

  This question presents you with a whole, 15, and then asks you to determine how much of that whole 3 represents in percentage form. Since a percent is “of 100,” to solve the question you have to set the fraction 3/ 15 equal to x?100:

  You then cross-multiply and solve for x:

  Converting Percents into Fractions or Decimals

  You should be skilled at converting percents into fractions and decimals, because these problems will definitely come up on the Math IC test.

  Percents relate to decimal numbers very simply and directly. A percent is a decimal number with the decimal point moved two decimal places to the left.

  For example:

  To convert from a decimal number to a percent, move the decimal point two places to the right:

  On an even more simplistic level, we can just say that 50% = .5 or 22.346% = .22346. Percentages greater than 100 exist, too. 235% = 2.35, for example.

  To convert from a percent to a fraction, take the percentage number and place it as the numerator over the denominator 100. 58 percent is the same as 58/ 100.

  To convert from a fraction back to a percent, the easiest method is to convert the fraction into a decimal first and then change the resultant decimal into a percent.

  以上就是关于“SAT2数学考试题目:Percents”的内容,更多精彩内容,请关注SAT频道!


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