Convert (65.125) 10 to octal.

101.1

Explanation:

Keep in mind that octal has 8 numbers

Step 1: Split your number in 2 parts (integer part and decimal part):

integer part 65 decimal part 0.125

Step 2: Convert the decimal part. For this step you need to multiply your decimal part and 8 (8 correspond the octal base) and get the integer part until you need it:

0.125 * 8 = 1

So your decimal part correspond to number 1 in octal = (1) 8

Step 3: Convert integer part: for this step you need to divide your integer part by 8 until you can and get the remainder

65 / 8 = 8 remainder 1

8 / 8 = 1 remainder 0

1 / 8 = 0 remainder 1

Step 4: join the remainders from bottom to top and get the integer part

101

Step 5: join the integer part and the decimal part to get the octal convertion

101.1