Adding and Subtracting Fractions with Unlike Denominators

Adding and Subtracting Fractions with Unlike Denominators

Multiple Choice

Which common multiple can be used as a common denominator to solve this problem?

 $\frac{2}{4\ }+\frac{2}{3}=$  

• 3

• 4

• 12

• 16

Multiple Choice

What is the next step to solve this problem?

• We're done!!

• Rewrite the equation with the equivalent fractions in the common denominator and solve

Multiple Choice

Are we totally done solving??

• Yes! We should always leave our answers as an improper fraction!!

• No, we need to convert it to a mixed number before we're done!

Multiple Choice

Convert to a mixed number.

 $\frac{14}{12}=$  

•  $1$  

•  $1\ \frac{2}{14}$  

•  $1\ \frac{2}{12}$  

• 1 r2

Multiple Choice

First we need to...

• add numerators and denominators

• convert to mixed numbers

• list the multiples of each DENOMINATOR to find a common denominator

• list the multiples of each NUMERATOR to find a common denominator

Multiple Choice

Which common multiple can be used as a common denominator to solve this problem?

 $\frac{8}{9}-\frac{3}{5}=$  

• 9

• 20

• 27

• 45

Multiple Choice

How do we convert to an equivalent fraction?

• multiply the numerator and denominator by the same number

• add the same number to the numerator and denominator

• multiply just the denominator by the same number

Multiple Choice

When we rewrite this subtraction equation, does it matter which fraction goes first?

• No! We can put them in any order.

• Yes! The SMALLER fraction needs to go first!

• Yes! The LARGER fraction needs to go first!

Multiple Choice

Are we totally done solving??

• Yes! Our answer is a proper fraction and can't be converted to a mixed number.

• No! We need to convert to a mixed number!

Poll

How well do you know the steps to add and subtract fractions with unlike denominators?

Poll

If you were to stay up all night, what would you be doing?