author: elliot hirsen
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a crash course in fractions on the act math test
a fraction consists of a numerator, a fraction bar, and a denominator. to add or subtract fractions, you just need to find a common denominator. for example ¼ + 1/3 = 3/12 + 4/12 = 7/12. all fractions are rational numbers. a rational number is a number that can be expressed as a ratio of…
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[video post] a history of the sat
there are few three-letter combinations that evoke such a potent mix of fear and disgust, (or, in sat-speak, trepidation and revulsion). first off, the sat has a troubled history, one that reaches as far back as the 19th century—depending on whom you ask. then there is the unavoidable reality of the sat: if you want…
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sat math: the fundamental counting principle
knowing this rule–or principle as it is called–will make certain questions on the sat much, much easier. before i tell you the rule though, let’s take a look at the following scenario. jane has white socks, red socks, and black socks (she must be a baseball fan!). additionally, she has four different shoes: tennis, basketball,…