Binary value of 9 decimal number

Result

9 = 1001

Explained

• 9 / 2 = 4.5
  1 remainder of division
• 4 / 2 = 2
  0 remainder of division
• 2 / 2 = 1
  0 remainder of division
• 1 / 2 = 0.5
  1 remainder of division

Read listed remainders in reverse:

9 = 1001