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).

You are watching: What is 9 percent of 100

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.

Let"s go with something a bit harder and four times much more delicious: 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.

See more: Which Formation Moves Sediment And Erodes Rock? ? Which Formation Moves Sediment And Erodes Rock

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.