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Subtraction of Unlike Fractions (Women’s Day Themed) Worksheets

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Unlike fractions are fractions that contains different denominators.



  • It is the result of multiplying numbers by another whole number
  • It is possible that a number can be a multiple of two or more numbers. This is called common multiple.
  • The smallest number that is common to two or more multiples is called least common multiple.
  • Determining the correct least common multiple (LCM) is needed to get the least common denominators of two unlike fractions. 
Multiples of 224681012
Multiples of 3369121518

Since the multiples of 2 contains 6 and 12 and the multiples of 3 contains 6 and 12 as well, 6 and 12 are already considered common multiples. 6 is the smallest common multiple, it is call the least common multiple of 2 and 3. 


  • These are numbers being multiplied together to produce another number.
  • Multiplying two or more numbers means that the factors are being multiplied together.
  • In fact, factors are numbers involved when we perform multiplication.


What are the factors of 18
The factors of 18 are 1, 2, 3, 6, 9, and 18. 


To find the GCF of two numbers:

  1.   List the prime factors of each number.
  2.   Multiply those factors both numbers have in common. If there are no common prime factors, the GCF is 1.
  3. GCF is needed in simplifying fractions or expressing them in simplest form.


Before you can subtract fractions with different denominators, 

  1. Find the smallest multiple (LCM) of both numbers.
  2. Rewrite the fractions as equivalent fractions with the LCM as the denominator.
  3. Always express the answer in simplest form.

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