a b c $$\dfrac{11}{17} + \dfrac{4}{17}$$ = Numerator— Denominator $$\dfrac{16}{19} − \dfrac{5}{19}$$ = Numerator— Denominator $$\dfrac{6}{24} + \dfrac{3}{8}$$ = Numerator— = Denominator Numerator— Denominator $$\dfrac{2}{7} − \dfrac{2}{21}$$ = Numerator— Denominator
 a b $$\dfrac{1}{6} + \dfrac{4}{6}$$ = $$\dfrac{5}{12}$$ or $$\dfrac{5}{6}$$ or $$\dfrac{7}{10}$$ $$\dfrac{5}{12} − \dfrac{1}{3}$$ = $$\dfrac{4}{9}$$ or $$\dfrac{4}{12}$$ or $$\dfrac{1}{12}$$