How do you convert 100010001111 to octal?

Answer 1

Assuming the original is in binary, you group the digits in threes (from the right). This is similar to the use of comma separators between billions, and millions and thousands in decimal numbers.

So 100010001111 = 100,010,001,111

Now, convert each triplet into its octal equivalent using the following table:

000 = 0 001 = 1 010 = 2 011 = 3

100 = 4 101 = 5 110 = 6 111 = 7

Thus the original number, converted to octal, is 4217.

Answer 2

1000 1000 1111 base 2 = 4217 base 8