cross multiplication

cross multiplication : In elementary arithmetic, given an equation between two fractions or rational expressions, one can cross-multiply to simplify the equation or determine the value of a variable. For an equation like the following: one can cross-multiply to get In practice, the method of cross-multiplying means that we multiply the numerator of each (or one) side by the denominator of the other side, effectively "crossing" the terms over. The mathematical justification for the method is from the following longer mathematical procedure. If we start with the basic equation: We can multiply the terms on each side by the same number and the terms will remain equal. Therefore, if we multiply the fraction on each side by the product of the denominators of both sides - $(bd)\backslash ,\backslash !$ - we get: We can reduce the fractions to lowest terms by noting that the b's on the left hand side and the d's on the right hand side cancel, leaving: and we can divide both sides of the equation by any of the elemen....   More from Wikipedia

  This video shows you how to multiply 2 digit number with ease!

  Table of contents listing all instructional math videos available from Chycho TV at www.chycho.com List of videos that are available for download at www.chycho.com INTRODUCTION: www.chycho.com During the last few years the education systems in Canada and the United States have been eroding. Students have been crammed into larger class sizes while the quality of teaching has deteriorated, in large part due to a lack of funding from local and federal governments. John Ralston Saul, one of ...

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