Adding and Subtracting Fractions with Unlike Denominators
Decimals, Fractions, and Percent, and more...

 1 EASY $$\frac{2}{7}+\frac{1}{7}=$$

 2 EASY $$\frac{7}{15}-\frac{4}{15}=$$

 3 EASY $$\frac{1}{2}+\frac{1}{4}=$$