21/2 divided by 80/4

21/2 ÷ 80/4
=
21 40
Decimal: 0.525
Percentage: 52.5%

Step-by-Step Solution

  1. 1
    Take reciprocal of second fraction
    80/4 becomes 4/80
  2. 2
    Multiply by reciprocal
    21/2 × 4/80
  3. 3
    Multiply numerators & denominators
    21 × 4 = 84    2 × 80 = 160
  4. 4
    Simplify
    84/160 = 21/40

How to Divide Fractions

To divide fractions, use "Keep, Change, Flip": keep the first fraction unchanged, change the ÷ to ×, then flip the second fraction. Multiply and simplify.

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