adding and subtracting fractions

Find the difference:  $\frac{5}{9}-\frac{3}{9}$  

• one ninth

• two ninths

• 8 ninths

• 3 ninths

Find the difference:  $\frac{5}{9}-\frac{3}{9}$  

• one ninth

• two ninths

• 8 ninths

• 3 ninths

 $\frac{4}{7}+\frac{1}{3}=$  

•  $\frac{17}{21}$  

•  $\frac{19}{21}$  

•  $\frac{5}{10}$  

•  $\frac{5}{21}$  

What must you have to add and subtract fractions?

• Common numerators
• Different numerators
• Different denominators
• Common denominators

What is the difference of these fractions in lowest terms?

• 7/9
• 1/5
• 12/20
• 1/20