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Convert 51 from decimal to octal

(base 8) notation:

Power Test

Raise our base of 8 to a power

Start at 0 and increasing by 1 until it is >= 51

80 = 1

81 = 8

82 = 64 <--- Stop: This is greater than 51

Since 64 is greater than 51, we use 1 power less as our starting point which equals 1

Build octal notation

Work backwards from a power of 1

We start with a total sum of 0:


81 = 8

The highest coefficient less than 7 we can multiply this by to stay under 51 is 6

Multiplying this coefficient by our original value, we get: 6 * 8 = 48

Add our new value to our running total, we get:
0 + 48 = 48

This is <= 51, so we assign our outside coefficient of 6 for this digit.

Our new sum becomes 48

Our octal notation is now equal to 6


80 = 1

The highest coefficient less than 7 we can multiply this by to stay under 51 is 3

Multiplying this coefficient by our original value, we get: 3 * 1 = 3

Add our new value to our running total, we get:
48 + 3 = 51

This = 51, so we assign our outside coefficient of 3 for this digit.

Our new sum becomes 51

Our octal notation is now equal to 63


Final Answer


We are done. 51 converted from decimal to octal notation equals 638.