From the course: Test Prep: GRE
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Ratios and proportions
- [Voiceover] This video, I'll talk about ratios and proportions, so these are really basic math concepts, but they're really useful, they pop up in a lot of real GRE problems. So, ratio is really just a relationship. It's also a fraction. So, I'll show you what I mean. Let's say I have a recipe, and for every two eggs, I have three cups of sugar. So, if I have a recipe or a word problem for that matter, that tells me for every two of something, I have three of something else, I can write that as a ratio. I can just say for every two eggs, there are three cups of sugar. So, it's just giving me a way to represent it mathematically. So, if I have a ratio like that, I can describe it as what I would call a part-to-part ratio. I'll explain what I mean by that. Part-to-part is basically giving me a relationship between the two parts. Then if I have a part-to-whole, that would be something like if I had four out of five dentists recommend Trident. So here, I have a relationship between the…
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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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