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Published byGeorgia Sylvia Butler Modified over 9 years ago

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**Add or subtract fractions with unlike denominators.**

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**Convert to an improper fraction.**

Convert to a mixed number. Write in simplest form. Write a fraction that is equivalent to .

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**VOCAB Least Common Multiple (LCM): Example: Find LCM(6,9)**

The smallest multiple that is common to 2 or more #’s. Multiples happen when U count by a # Example: Find LCM(6,9) Count by 6: … Count by 9: … Next Slide >>

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**Find the Least Common Multiple (LCM) of 4 and 5**

Count by 5: … Count by 4: … 20 is the LCM of 4 and 5

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**Find the Least Common Multiple (LCM) of 4 and 5**

Count by 5: … Does 4 go into 5 evenly? No. Does 4 go into 10 evenly? Does 4 go into 15 evenly? No Does 4 go into 20 evenly? YES!! Bingo!!! 20 is the LCM of 4 and 5

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**EZ Example Find the value of .**

The fractions already have common denominators. Add numerators. Write in simplest form.

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**Add or subtract the numerators. **

Get the bottoms the same by making equivalent fractions (multiply top AND bottom by the same #) (using the least common denominator is optional). Add or subtract the numerators. Write the sum or difference over the common denominator. Write the fraction in simplest form.

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Find the value of The LCM of 3 and 4 is 12. Rewrite fractions. Subtract.

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x 5 4 x 2 3 x 1 8 3 = = 3 x 4 12 12

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Always Check For Simplest Form or Lowest Terms.

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**Write each answer in simplest form.**

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**What do you find to be the most difficult part about**

adding or subtracting fractions?

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