Question

octal to decimal
78
please explain step by step ​

Answer 1

Answer:

Formula(Octal to Decimal):

Let Octal number have ‘n’ digits.

F(n) = (Last Digit)*pow(8,0) + (Second last digit)*pow(8,1) + … + (first digit)*(8,n-1).

Example:

Decimal = 116

Octal = 78

Answer 2

Answer:

Multiply each digit with powers of 8 and add them.

In your example there's two digits in the number. 8 at ones place and 7 at tens place.

Now what you've gotta do is start from the ones place by multiplying it with 8^0. Multiply tens place, i.e., 7 with the next power of 8, i.e., 8^1.

decimal equivalent of 78

= (7 X 8^1) + (8 X 8^0)

= 56 + 8

= 64

I've done another example for you

decimal equivalent of 100

= (1 X 8^2) + (0 X 8^1) + (0 X 8^0)

= 64 + 0 + 0

= 64

Just remember always start off at ones place.

Hope this helped :)