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To find what percent of number y is number x, you should divide number x by number y. Then multiply your result by 100 and this will give you the percentage. Your formula should look like x/y * 100.
To find what number of x is a total of some percentage, you should divide the known percentage by 100 and multiply your result by number x. Your formula should look like y%/100 * x.

How to calculate percentages - HelpingWithMath.com

www.helpingwithmath.com/by_subject/percentages/per_calculating.htm

Instruction and guidance on how to calculate percentage values. ... The following two examples show how to calculate percentages. 1) 12 people out of a total of ...

Introduction to Percentages - Math is Fun

www.mathsisfun.com/percentage.html

percent grid 5 of 100. 5% means <sup>5</sup>/100ths. Example: ... Read more about this at Decimals, Fractions and Percentages. ... Example: Calculate 25% of 80 ...

3 Easy Ways to Calculate Everyday Percentages - wikiHow

www.wikihow.com/Calculate-Percentages

A percentage is a way to express a number as a part of a whole. To calculate a percentage, we look at the whole as equal to 100%. For example, say you have ...

Basic "Percent of" Word Problems - Purplemath

www.purplemath.com/modules/percntof.htm

Sections: Basic percentage exercises, Markup / markdown, General increase / decrease ... In the above example, I first had to figure out what the actual tax was.

Formula for Percentage - Basic mathematics

www.basic-mathematics.com/formula-for-percentage.html

Use this very straightforward formula for percentage to solve quickly any problems involving ... Study it below carefully before looking at the examples ...

Percentage Calculator with detailed explanation - Math Portal

www.mathportal.org/calculators/numbers-calculators/percentage-calculator.php

Calculators :: Numbers :: Percentage Calculator ... This online calculator solves the four basic types of percent problems and percentage ... Generate Example ...

The Math Dude : How to Quickly Calculate Percentages :: Quick and ...

www.quickanddirtytips.com/education/math/how-to-quickly-calculate-percentages

Dec 2, 2016 ... How to calculate percentages is easier than you think. ... Taking our example from before, this rule says that 36% of 25 is the same as 25% of ...

Percentage Calculator, Formula & Solved Example - Ncalculators

ncalculators.com/number-conversion/percentage-calculator.htm

The formula, step by step calculation & solved example problems may used to understand how to calculate the percentage of marks, interest or any relative ...

How to Calculate percentages by example « Math

math.wonderhowto.com/how-to/calculate-percentages-by-example-301940/

Mar 9, 2010 ... In this tutorial the author explains of how to find percentages using examples. He explains that x percent of some number y is x multiplied by y ...