Multiply And Divide Rational Numbers Multiply And Divide Rational Numbers As we know Rational Numbers are those numbers which can be represented in the form of fractions. Here fraction contains two integers, the upper part is numerator and lower part is denominator. But there is a condition that the denominator can't be 0. Through this section we study “how to multiply and divide rational numbers”. If you have basic knowledge about the rational numbers then this topic becomes easy to understand the basic concept of multiplication and division of rational numbers. Here are some examples given below which helps you to understand the concept of rational numbers. Example: Multiply the 5/8 * 12/25? Now there is one approach to multiply the given rational numbers as numerator to numerator and denominator to denominator. As given below: 5/8 * 12/25 = 60/200 After that we can reduce this answer by the common factor. Here, the common factor is 20 so we can cut both the numerator and denominator.
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ultiplying and dividing positive and negative numbers is a simple operation with two numbers. With three or more, it is also straightforward, but you use the Even-Odd Rule. With two numbers, the rules for multiplying and dividing positive and negative numbers are not only simple, but they’re also the same for both operations: When multiplying or dividing two numbers, if the two signs are the same, the result is positive, and if the two signs are different, the result is negative. When multiplying and dividing more than two numbers, count the number of negatives to determine the final sign: An even number of negatives means the result is positive, and an odd number of negatives means the result is negative. You multiply and divide positive and negative numbers “as usual” except for the positive and negative signs. So ignore the signs and multiply or divide. Then, if you're dealing with two numbers, the result is positive if the signs of both numbers are the same, and the result is negative if the signs of both numbers are different. When multiplying and dividing more than two positive and negative numbers, use the EvenOdd Rule: Count the number of negative signs — if you have an even number of negatives, the result is positive, but if you have an odd number of negatives, the result is negative. Turning from addition and subtraction, how do you do multiplication and division with negatives? Actually, we've already covered the hard part: you already know the "sign" rules: plus times plus is plus (adding many hot cubes raises the temperature) minus times plus is minus (removing many hot cubes reduces the temperature) plus times minus is minus (adding many cold cubes reduces the temperature)
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minus times minus is plus (removing many cold cubes raises the temperature) The sign rules work the same way for division; just replace "times" with "divided by". Here are a couple examples of the rules in division: Copyright © Elizabeth Stapel 1999-2011 All Rights Reserved (Remember that fractions are just another form of division!) You may notice people "canceling off" minus signs. They are taking advantage of the fact that "minus times minus is plus". For instance, suppose you have (–2)(–3)(–4). Any two negatives, when multiplied together, become one positive. So pick any two of the multiplied (or divided) negatives, and "cancel" their signs:
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