From the course: Test Prep: GRE
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Taking percents and increasing by percents
From the course: Test Prep: GRE
Taking percents and increasing by percents
- [Voiceover] The next percent skills I need to cover are taking a percent and then increasing and decreasing by a percent. So this vocabulary for percent problems is really the biggest challenge for a lot of students. The actual math is not so hard. So let's say I had to take a percent of something. So that might be worded with what is 25% of 200? OK, so one thing we could do here to take a percent of a number, it's pretty easy, we just take the number and we multiply it by the decimal that the percent converts into, so remember, 25% we could rewrite it as .25. And then we would just multiply 200 by .25 and we would get 50. So that's how we take 25% of 200. We multiply the number by the corresponding decimal that the percents can convert into. Again, we're not really changing 25% by rewriting it as .25, we're just rewriting it in a different form. So that's taking a percent. How would we increase or decrease by a percent. Let's say we had to increase 200 by 25%. OK, well, it's kind…
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Contents
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Integers: Factors, multiples, and remainders2m 7s
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Integers: Even and odd and primes3m 29s
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Order of operations2m
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Number properties3m 46s
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Adding and subtracting fractions3m 36s
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Multiplying and dividing fractions1m 22s
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Decimals3m 9s
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Mental percents2m 55s
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Taking percents and increasing by percents1m 55s
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Percent change3m 36s
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Ratios and proportions4m 20s
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Direct proportion and inverse variation3m 6s
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Exponents2m 7s
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More exponents2m 7s
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Fake exponent rules2m 10s
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Scientific notation3m 32s
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Square roots3m 45s
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Cube and fourth roots2m 34s
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