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Tham khảo tài liệu 'gmat exam success_10', ngoại ngữ, anh ngữ phổ thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | CHAPTER 23 Tips and Strategies for the Quantitative Section The following bullets summarize some of the major points discussed in the lessons and highlight critical things to remember while preparing for the Quantitative section. Use these tips to help focus your review as you work through the practice questions. When multiplying or dividing an even number of negatives the result is positive but if the number of negatives is odd the result is negative. In questions that use a unit of measurement such as meters pounds and so on be sure that all necessary conversions have taken place and that your answer also has the correct unit. Memorize frequently used decimal percent and fractional equivalents so that you will recognize them quickly on the test. Any number multiplied by zero is equal to zero. A number raised to the zero power is equal to one. Remember that division by zero is undefined. For complicated algebra questions substitute or plug in numbers to try to find an answer choice that is reasonable. 367 ------------- TIPS AND STRATEGIES FOR THE QUANTITATIVE SECTION ---------------------------------------- When given algebraic expressions in fraction form try to cancel out any common factors in order to simplify the fraction. When multiplying like bases add the exponents. When dividing like bases subtract the exponents. Know how to factor the difference between two squares x2 - y2 x y x - y . Use FOIL to help multiply and factor polynomials. For example x y 2 x y x y x2 xy xy y2 x2 2xy y2. When squaring a number two possible choices result in the same square i.e. 22 4 and -2 2 4 . Even though the total interior degree measure increases with the number of sides of a polygon the sum of the exterior angles is always 360 degrees. Know the rule for 45-45-90 right triangles The length of a leg multiplied by VÌ2 is the length of the hypotenuse. Know the rule for 30-60-90 right triangles The shortest side doubled is the hypotenuse and the shortest side times V T is the .
