Convert 68 to base eight.

Question

A. 104

B. 102

C. 140
D. 120

Answer 1

There are a couple of ways to do this.

Take the first digit and multiply by 2 but express the result in octal (base 8), so 2×6=14, then add using octal arithmetic 68+14=104, because 8+4=14 octal; then 6+1+carried 1=10 octal.

Another method is to divide 68 by 8=8 which is 10 octal remainder 4: 104, answer A.