18/2 divided by 21/4

18/2 ÷ 21/4
=
12 7
Mixed Number: 1 5/7
Decimal: 1.714286
Percentage: 171.43%

Step-by-Step Solution

  1. 1
    Take reciprocal of second fraction
    21/4 becomes 4/21
  2. 2
    Multiply by reciprocal
    18/2 × 4/21
  3. 3
    Multiply numerators & denominators
    18 × 4 = 72    2 × 21 = 42
  4. 4
    Simplify
    72/42 = 12/7

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.

Try Another Calculation