Ответ:

  1. \(3 \times 7 = 21\);
  2. \(24 : 6 = 4\);
  3. \(48 : 8 = 6\);
  4. \(54 : 9 = 6\);
  5. \(9 \times 7 = 63\);
  6. \(18 : 6 = 3\);
  7. \(27 : 9 = 3\);
  8. \(5 \times 8 = 40\).