Ответ:

  1. \(16\cdot\frac18=\frac{16}{8}=2\).
  2. \(15\cdot\frac7{25}=\frac{15\cdot7}{25}=\frac{21}{5}=4\frac15\).
  3. \(21\cdot\frac5{14}=\frac{21}{14}\cdot5=\frac32\cdot5=7\frac12\).
  4. \(26\cdot\frac7{13}=2\cdot7=14\).