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Unformatted text preview: Fraction XII
Fraction XII
Subtracting Unlike Denominators
By Monica Yuskaitis Common Multiple
Common Multiple
A number that is a multiple of two or more numbers. Some multiples of 4 & 6
12, 24, 36 Least Common Multiple
Least Common Multiple The smallest common multiple of a set of two or more numbers. 8 = 8, 16, 24, 32, 40, 48
6 = 6, 12, 18, 24, 30, 36 Shortcut for Finding the Least Shortcut for Finding the Least Common Denominator or Least Common Multiple
Check to see if the smaller denominator
divides evenly into the larger denominator.
If it does, use the larger denominator for
your LCD or LCM. 1
3
1
9 3 will divide evenly into 9,
so 9 is your LCD or LCM. To Subtract Fractions With To Subtract Fractions With Unlike Denominators Find the multiples of each denominator. 1
5 = 5, 10, 15, 20, 25, 30
1
 10 = 10, 20, 30, 40, 50 To Subtract Fractions With To Subtract Fractions With Unlike Denominators Compare the lists of multiples. Circle the common multiples between the two lists. 1
5 = 5, 10, 15, 20, 25, 30
1
 10 = 10, 20, 30, 40, 50 To Subtract Fractions With To Subtract Fractions With Unli...
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This note was uploaded on 11/22/2011 for the course EL ED 361 taught by Professor Brotherraymond during the Fall '11 term at BYU.
 Fall '11
 BrotherRaymond

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