Calculate percentages with mental math
Learn to calculate a certain percentage of a number using mental math. Once you can find 10% and 1% of any number, you can use those to find other percentages. Learn more about percentages and how to use them in my book Math Mammoth Percent at http://www.mathmammoth.com/percent.php and in Math Mammoth Grade 6 curriculum at http://www.mathmammoth.com/complete/g...
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