Adding & Subtracting Fractions unlike denominators

Adding & Subtracting Fractions unlike denominators

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By the end of this lesson you will be able to...

• Identify the numerator and the denominator in a fraction

• Add fractions with both like and unlike fractions

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Vocabulary

• Numerator

• Denominator

• Improper Fraction

Like Fractions

Adding Like Fractions

Subtracting Like Fractions

Multiple Choice

What is 

 $\frac{1}{8}+\frac{5}{8}=$  

• 1

•  $\frac{6}{16}$  

•  $\frac{6}{8}$  

Multiple Choice

 $\frac{3}{9}+\frac{2}{9}=$  

•  $\frac{2}{9}$  

•  $\frac{0}{9}$  

•  $\frac{5}{9}$  

Multiple Choice

 $\frac{4}{5}-\frac{1}{5}=$  

•  $\frac{5}{5}$  

•  $\frac{3}{5}$  

•  $\frac{3}{0}$  

Multiple Choice

 $\frac{13}{24}-\frac{11}{24}=$  

•  $\frac{2}{12}$  

•  $\frac{24}{24}$  

•  $\frac{2}{24}$  

Unlike Fractions

Changing Unlike to Like denominator

• Find a common multiple that will go into both denominators.

Changing Unlike to Like Denominators

Multiple Choice

What is the least common denominator of 

 $\frac{1}{4}$  and  $\frac{2}{5}$  

• 5

• 25

• 10

• 20

Multiple Choice

What is the least common denominator of  $\frac{1}{4}$  and  $\frac{1}{3}$  

• 4

• 3

• 12

• 8

Multiple Choice

What is the least common denominator of 

 $\frac{6}{8}$  and  $\frac{4}{12}$   

• 12

• 24

• 8

• 16

Once you find the common denominator add the fractions together

Multiple Choice

 $\frac{9}{10}-\frac{3}{4}$  

• 5/7

• 3/20

• 3/8 

• 9/10

Multiple Choice

 $\frac{8}{9}-\frac{5}{6}$  

• 1/18

• 3/4

• 6/7

• 10/12

Multiple Choice

 $\frac{2}{6}+\frac{1}{2}$  

• 5/6

• 3/6

• 4/6

• 3/8

Quick Check

We're going to split into two groups and continue to practice our skills. Make sure you have a pencil and paper or whiteboard and marker.