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Math6 min read

Scores, decimals, percentages to one another: a table is done

Scores, decimals, percentages are by nature one family, with a few correspondences, and heart-to-heart conversions no longer take place.

Scores, decimals, percentages are actually saying the same thing: "How much is part of the whole" but in different ways. For example, one half = 0.5 = 50 per cent, one quarter = 0.25 = 25 per cent. (a) Divide the percentage by 100 (delegate the percentage number and move two decimal places to the left); See the decimal fractions after the decimal points: one is a decile and two is a percentage, for example 0.75 = 75/100 = 3/4. To understand this relationship, many Percentage increase/decrease questions are no longer Rovers.

The most common set of counterparts

  • 1/2 = 0.5 = 50 per cent; 1/4 = 0.25 = 25 per cent; 3/4 = 0.75 = 75 per cent
  • 1/3 ≈ 0.333 = 33.3 per cent; 2/3 ≈ 0.667 = 66.7%
  • 1/5 = 0.2 = 20 per cent; 1/8 = 0.125 = 12.5 per cent; 1/10 = 0.1 = 10%
  • Remember that 80% of the day-to-day conversion can be done in seconds without having to pull the calculator.
(a) When a "20% increase" is encountered, do not add 0.2 directly, which means multiplying 1.2 by the original number; The difference between "to 20 percent" and "to" is by 0.2 — five times the result, which is the most high-frequency pit in Percentage trap.

If you change your skills, you can make a quick estimate with Heart count percentage skills, like 15% tip, 10% first, plus half 10%. In units of conversion, decimals and fractions are often used, such as the Common unit conversion error joke of misappropriating 0.5 kg to 5 kg. Treating points, decimals and percentages as three sides of the same coin makes you more comfortable when you make a discount, understand the statistical news and look at the financial statements.