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In order to ADD fractions, you must have a common denominator. This means a number that each of the denominators divides evenly into. You need to find a number that 3, 12, and 5 all divide evenly. One way to do this is to take MULTIPLES of the largest number, which is 12, and keep going until you find a number that can be also divided by 3 and 5. This means start with 12, 24, 36, 48, 60, etc. Did you see that 60 can be divided by 3 and 5? \r
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\n" ); document.write( "\n" ); document.write( "Now, you need to change each fraction 1/3, 5/12, and 4/5 into fractions whose denominator is 60. To do this, the denominator 3 must be multiplied by 20, the denominator 12 must be multiplied by 5, and the denominator 5 must be multiplied by 12. It looks like this:\r
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\n" ); document.write( "\n" ); document.write( "What this means is that you have:
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\n" ); document.write( "\n" ); document.write( "Now add up all these numerators, and put the answer over the common denominator which is 60:\r
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\n" ); document.write( "\n" ); document.write( "The fraction reduces since you can divide both 93 and 60 by 3:
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\n" ); document.write( "\n" ); document.write( "This is an improper fraction, which is actually preferred in higher math, but in lower math they might want a mixed fraction. You may want to write this as
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