how do you subtract a fraction and a whole number?
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When subtracting fractions from whole numbers, you need to change the whole number into a fraction. You then need to make a common denominator and then you can subtract the two numerators and you're all set.
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The Simplest Method is to Use a Calculator Steps: Divide the top of the fraction by the bottom, Then multiply the result by 100 and read off the answer !
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In other words, multiply by 100 percent minus the percentage you want to subtract, in decimal form. To subtract 20 percent, multiply by 80 percent (0.8). To subtract 30 percent, multiply the number by 70 percent (0.7).
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["Multiply the whole number part by the fraction's denominator.", 'Add that to the numerator.', 'Then write the result on top of the denominator.']
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Here's the easy way to subtract fractions that have different denominators: Cross-multiply the two fractions and subtract the second number from the first to get the numerator of the answer. After you cross-multiply, be sure to subtract in the correct order.
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Then, adjust the fractions to have like denominators by multiplying the new fraction by the denominator of the original fraction. Subtract the numerators of the two numbers, and convert the answer to a mixed number if necessary. Remember to reduce the fraction if possible or divide it into a whole number.
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["Let's convert 1 1/4 into an improper fraction.", "First, we'll need to find out how many parts make up the whole number: 1 in this example.", "To do this, we'll multiply the whole number, 1, by the denominator, 4.", '1 times 4 equals 4.', "Now, let's add that number, 4, to the numerator, 1."]
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Divide the percentage by 100 to get a decimal number. Use that number as the numerator (top) of a fraction. Put a 1 in the denominator (bottom) of the fraction. Convert the decimal to a whole number: Count how many places are to the right of the decimal.
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Subtracting Whole Numbers, with Regrouping When you regroup, you rewrite the number so you can subtract a greater digit from a lesser one. When you're subtracting, just regroup to the next greater place-value position in the minuend and add 10 to the digit you're working with.
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To do this, give the whole number a denominator of 1. Convert to fractions of like denominators. The original fraction's denominator is also the least common denominator (LCD) of the two fractions. Multiply the top and bottom of the "whole number fraction" by this number so the fractions have the same denominator.
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['subtract the Y values,', 'subtract the X values.', 'then divide.']
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['Multiply the integer (whole number) by the denominator.', 'Add that to the numerator.', 'Write the answer on top of the original denominator.']
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Explanation: Subtracting a negative fraction B from a positive fraction A means adding the number part of it (that means leaving the minus sign) to A .
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To do this, you need to find the least common multiple (LCM) of the two denominators. To subtract fractions with unlike denominators, rename the fractions with a common denominator. Then subtract and simplify. The LCM of 3 and 11 is 33 .
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If the fraction portion of a mixed number, such as 2 5/6, is more than the fraction portion of the mixed number you're trying to subtract from, such as 3 1/6, you must “borrow” from the whole number of the mixed number you're trying to subtract from to make its fraction bigger.
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How to add or subtract percentages. If your calculator does not have a percent key and you want to add a percentage to a number multiply that number by 1 plus the percentage fraction. For example 25000+9% = 25000 x 1.09 = 27250. To subtract 9 percent multiply the number by 1 minus the percentage fraction.
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['Step 1: Make sure the bottom numbers (the denominators) are the same.', 'Step 2: Add the top numbers (the numerators), put that answer over the denominator.', 'Step 3: Simplify the fraction (if needed)']