Cynthia completed \(\cfrac{2}{3}\) of the items on her to-do list in the morning and finished \(\cfrac{1}{8}\) of the items during her lunch break. What fraction of her to-do list is finished by the end of her lunch break? (Extension: What fraction of her to-do list does she still have to do after lunch?)
Sam read \(\cfrac{2}{5}\) of her book over the weekend and \(\cfrac{1}{6}\) of it on Monday. What fraction of the book has she read? What fraction of the book is left?