SOLUTION STEPS:
  1. To convert a fraction to a decimal, divide the numerator by the denominator, or make an equivalent fraction with denominator 10, 100, or 1000.
  2. 21/20 = 1 1/20. Convert 1/20: multiply top and bottom by 5 to get 5/100 = 0.05.
  3. 1 + 0.05 = 1.05. So 21/20 = 1.05 as a decimal.