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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.

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

Instruction and guidance on how to calculate percentage values.

www.wikihow.com/Calculate-Percentages

Knowing how to calculate percentages will help you not only score well on a math test, but in the real world as well. Read this wikiHow to learn how to calculate ...

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

Use this very straightforward formula for percentage to solve quickly any problems involving ... We will only use it to inform you about new math lessons.

www.calculatorsoup.com/calculators/math/percentage.php

Percentage calculator online to find percentage of a number, calculate x as a percent of y, find a number given percent. How to work out percentage formulas.

percentagecalculator.net

What is the percentage increase/decrease from to ? %. Tips: Use tab to move to the next field. Use shift-tab to move to the previous field. Press enter to calculate.

www.homeschoolmath.net/teaching/percent/what_percentage.php

How to calculate percentages. Learn how to calculate percentages in this easy lesson! When you're asked to calculate an (unknown) percentage ("What ...