Adding/Subtracting Fractions  Step 1:  Find common denominator  NOTE: If the denominators are the same go to Step 3  Step 2:  Change fractions into.

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Presentation transcript:

Adding/Subtracting Fractions  Step 1:  Find common denominator  NOTE: If the denominators are the same go to Step 3  Step 2:  Change fractions into equivalent fractions with same denominator  Step 3:  Add/Subtract the numerator  Step 4:  Carry across the denominator  Step 5  Ensure nothing can be simplified

RULE: Parentheses has a mathematical symbol + between meaning to add the fractions. NOTE: The first fraction is positive, the second fraction is negative. Thus, this will be subtraction

Written as subtraction

LCD: Find least common denominator LCD: Evenly divides 18 and 6

How about 18? Change fraction to equivalent fractions with denominator of 18

Multiply by 1 does not change the fraction

No need for parentheses Subtract the numerators and carry the denominator

Look to see if anything can be simplified? Divide out a 2 in the numerator and denominator

Final answer