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How Do You Find 25 Percent of a Number OR

How Do You Find 25 Percent of a Number

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If you need to find 25 percent of a number, it might be best to expand the number you are given. For example, if you need to find 25 percent of 100, you can use 3 with the remainder of the number being 0.

Percent

It is valuable to know the origin of the term â€‹percentâ€‹ if you want to truly understand how to calculate a percentage. The word â€‹percentâ€‹ comes from the phrase per cent. â€‹Centâ€‹ is a root that means one hundred, so per cent literally means per one hundred. For example, if you know that 30 percent of the students in a school are boys, that means that there are 30 boys per one hundred students. Another way to say this is that 30 out of 100 students are boys.

How much is 15 percent of 210? How about 75 percent of 440 or 350 percent of 20? The standard way of calculating percentages can make these problems difficult to do without a calculator. Luckily, there are several tips and tricks you can use to solve percentage problems without a calculator. Once you understand these simple methods, these questions become easy to solve. (Source: sciencing.com)

Use

How much is 15 percent of 210? How about 75 percent of 440 or 350 percent of 20? The standard way of calculating percentages can make these problems difficult to do without a calculator. Luckily, there are several tips and tricks you can use to solve percentage problems without a calculator. Once you understand these simple methods, these questions become easy to solve. To work out the percentage change in a specific number, follow two steps. For example, imagine that an item is usually \$50, but it’s currently available for \$45. First, find the total change in the amount. Do this by subtracting the old value from the new one. In the example, \$45 − \$50 = −\$5. Here, the minus sign indicates that the price has decreased. Then use the method in the first section to work out what percentage of the original price this is. In the example:

Once you have mastered the tricks mentioned above, there are a few more strategies you can use to find more percentages in your head. For example, if you can find 10% of a number, then you can also find 90% of that number with just one extra step. You just need to subtract the 10% from the original number. So, let's say you need to figure out how many people 90% of 150 people is. You can easily figure out that 10% of 150 is 15. 90% is 10% less than all 150 people. So, figure out 150 - 15, which is 135. Therefore, 90% of 150 is 135. (Source: study.com)

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