Subtracting Mixed Numbers and Fractions Common Denominator

When adding and subtracting fractions, which value needs to be the same in all values being added/subtracted?

• Numerator

• Denominator

What is the first step of adding or subtracting two fractions?

• Checking if the numerators are the same

• Checking if the denominators are the same or different

• Checking that the fractions are equal

• Adding or subtracting

Subtraction:
Find Lowest Common Denominator & solve
8    5/7    -    7    2/3 = 

•   3/4

•  1/21

•    1/24 

•   3/24

Subtraction:
Find Lowest Common Denominator & solve :
5    2/8   -   1    1/6 =

• 4     2/24

• 4     3/18

• 4    7/12

• 4    3/12

Subtraction:
Find Lowest Common Denominator & solve
8    6/9    -    3    2/5  =

• 6

• 4

• 5   12/45

• 5   4/60

Word Problem:
Two cats, Fluffy and Oreo, met in the Park. Fluffy's tail is 3   1/3 of a meter long. Oreo's tail is 2   1/4 of a meter long.
How much Longer is Fluffy's tail than Oreo's tail?

• 5     7/12

• 1     1/12

• 1     2/7

• 5     2/12

When the denominators are not the same, I must find a...

• common numerator

• common denominator

• equivalent fraction

• mixed number

Solve and simplify to lowest terms.

• a

• b

• c

• d

What must you do first in order to add or subtract fractions with unlike denominators?

• add the numerators

• add the denominators

• find a common denominator

• find a common numerator