A percent is likewise a means to to express the **relation between two numbers together a fraction of 100**. In other words, the percent tells us exactly how one number relates to another. If we recognize that number A is 25% that number B, we know that A come B is prefer 25 is to 100, or, after one an ext transformation, favor 1 come 4, i.e., A is 4 times smaller than B. This is what the portion calculator teaches; what is a percentage and also how to find a portion of two numbers. The is essential and practical knowledge. Why? Let"s say the B to represent the mass of a human being body or the fixed of some air. Then, by denoting A together a fixed of water, we can uncover out what is the full body water percent or loved one humidity (used to calculate the dew allude of air).

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How to discover a percentage of something? It"s easiest to describe what is the percent with cookies. That is surprising how frequently cookies save the day, right? to speak we have actually a big drawer with 100 compartments (a 10 x 10 grid). Every compartment is one hundredth or 1% of the whole drawer. Us then fill this drawer through cookies in a method that gives us exactly **the same number of cookies** in every compartment.

At first, let"s begin with the many straightforward instance with **100 cookies**. Exactly how to gain the percentage of several, let"s say, five cookies? It"s easy: every compartment gets precisely one cookie. For this reason **one percent the 100 is one cookie**, and also five percent is 5 cookies.

**400 cookies**! We"re separating them evenly, and every compartment gets four cookies. Cookies look smaller, but in ours imagination, they space the same, just the drawer is much bigger!

**One percent of 400 is 4**. How around 15 percent? It"s 15 compartments times four cookies - 60 cookies. Our tummies begin to ache a little, yet it has actually never quit us indigenous eating much more cookies! Now, something also harder -

**250 cookies**. Oh-oh, we divided up the first 200 cookies, placing 2 in every compartment. Currently we space left through 50 cookies that should be spread evenly, hmmm, it"s half a cookie in every box. How to calculate the percentage? friend are best - this time,

**1 percent the the total number of 250 cookie is 2.5**. How numerous do we have in 15 boxes? 2.5 * 15 is 37.5. So what is percentage an excellent for? together we created earlier, a portion is a means to refer a ratio. To speak you are taking a graded exam. If we told you that you obtained 123 points, that really would certainly not tell girlfriend anything.

**123 out of what?**Now, if us told you that you got

**82%**, this figure is much more understandable information. Even if us told you, you gained 123 out of 150; it"s harder to feel how well you did. A mainly earlier, there was another exam, and also you score 195 that 250, or 78%. When it"s tough to to compare 128 the 150 come 195 of 250, it"s straightforward to tell the 82% score is far better than 78%. Isn"t the percent authorize helpful? after all,

**it"s the percentage that counts**!

What around decimal fractions and also percentages? **Percentages can quickly be convert to decimals.** just divide the percent by 100, and also you space set. 15% is the same as 0.15. So as we have shown before, 0.15 that 250 cookies is thirty-seven and a half.

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Percentages are sometimes far better at expressing assorted quantities 보다 decimal fountain in chemistry or physics. For example, that is much convenient come say that percentage concentration that a specific substance is 15.7% than that there are 18.66 grams of problem in 118.66 grams of equipment (like in an example in portion concentration calculator). Another example is performance (or its special instance - Carnot efficiency). Is it much better to say the a car engine works with an efficiency of 20% or that it produces an power output of 0.2 kWh from the input energy of 1 kWh? What carry out you think? We space sure the you"re already well mindful that knowing just how to gain a percentage of a number is a beneficial ability.