Subtracting Fractions With Unlike Denominators.

What is the first thing you must ask yourself when subtracting fractions?

• Are the denominators the same?

• What is the common denominator?

• What numbers do I skip count by?

 $\frac{2}{3}-\frac{2}{5}$  What is the lowest common denominator?

• 8

• 15

• 20

• 30

 $\frac{2}{3}-\frac{2}{5}$  What should the new equation with the new fractions with like denominators be?

•  $\frac{1}{15}-\frac{2}{15}$  

•  $\frac{10}{15}-\frac{6}{15}$  

•  $\frac{2}{8}-\frac{2}{8}$  

 $\frac{2}{3}-\frac{2}{5}=?$  

•  $\frac{4}{8}$  

•  $0$  

•  $\frac{4}{15}$  

 $\frac{1}{2}-\frac{2}{5}\$  What is the common denominator?

• 15

• 7

• 10

 $\frac{1}{2\ }-\frac{2}{5}$  What is the new equation with the new fractions with common denominators?

•  $\frac{1}{10}-\frac{2}{10}$  

•  $\frac{1}{7}-\frac{2}{7}$  

•  $\frac{5}{10}-\frac{4}{10}$  

 $\frac{1}{2}-\frac{2}{5}=?$  

•  $\frac{1}{10}$  

• 0

•  $\frac{1}{7}$  

 $\frac{4}{6}-\frac{2}{4}$  What is the common denominator for these two fractions?

• 10

• 24

• 12

 $\frac{4}{6}-\frac{2}{4}$  What is the new equation with the new fractions with common denominators?

•  $\frac{4}{10}-\frac{2}{10}$  

•  $\frac{8}{12}-\frac{6}{12}$  

•  $\frac{4}{24}-\frac{2}{24}$  

 $\frac{4}{6}-\frac{2}{4}=?$  

•  $\frac{2}{6}$  

•  $\frac{2}{2}$  

•  $\frac{2}{12}$