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Convert 12 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 >= 12

80 = 1

81 = 8

82 = 64 <--- Stop: This is greater than 12

Since 64 is greater than 12, 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 12 is 1

Multiplying this coefficient by our original value, we get: 1 * 8 = 8

Add our new value to our running total, we get:
0 + 8 = 8

This is <= 12, so we assign our outside coefficient of 1 for this digit.

Our new sum becomes 8

Our octal notation is now equal to 1


80 = 1

The highest coefficient less than 7 we can multiply this by to stay under 12 is 4

Multiplying this coefficient by our original value, we get: 4 * 1 = 4

Add our new value to our running total, we get:
8 + 4 = 12

This = 12, so we assign our outside coefficient of 4 for this digit.

Our new sum becomes 12

Our octal notation is now equal to 14


Final Answer


We are done. 12 converted from decimal to octal notation equals 148.