[Bí quyết luyện thi SAT (New SAT)]- Câu hỏi toán (English version)

Whenever you know how to answer a question directly, just do it. I he tactics that are reviewed below should be used only when you need them.

       Memorize all the formulas you need to know. Even though some of them are printed on the first page of each math section, during the test you do not want to waste any time refer­ring to that reference material.

       Be sure to bring a calculator for use on the long math section, but use it only when you need it. Don’t use it for simple arithmetic that you can easily do in your head.

       Remember that no problem requires lengthy or difficult computations. If you find yourself doing a lot of arithmetic, stop and reread the question. You are probably not answering the question asked.

       Answer every question you attempt. Even if you can’t solve it, you can almost always eliminate two or more choices. Often you know that an answer must be negative, but two or three of the choices are positive, or an answer must be even, and some of the choices are odd.

       Unless a diagram is labeled “Note: Figure not drawn to scale,” it is perfectly accurate, and you can trust it in making an estimate.

       When a diagram has not been provided, draw one, especially on a geometry problem.

       If a diagram has been provided, feel free to label it, and mark it up in any way, including adding line segments, if necessary.

       Answer any question for which you can estimate the answer, even if you are not sure you are correct.

       Don’t panic if you see a strange symbol in a question; it will always be defined. Getting the correct answer just involves using the information given in the definition.

       When a question involves two equations, the most useful thing to do is to add them or subtract them. If there are three or more, just add them.

       Never make unwarranted assumptions. Do not assume numbers are positive or integers. If a question refers to two numbers, do not assume that they have to be different. If you know a figure has four sides, do not assume that it is a rectangle.

       Be sure to work in consistent units. If the width and length of a rectangle are 8 inches and 2 feet, respectively, either convert the 2 feet to 24 inches or the 8 inches to two-thirds of a foot before calculating the area or perimeter.

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