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Convert 86 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 >= 86

80 = 1

81 = 8

82 = 64

83 = 512 <--- Stop: This is greater than 86

Since 512 is greater than 86, we use 1 power less as our starting point which equals 2

##### Build octal notation

Work backwards from a power of 2

We start with a total sum of 0:

##### 82 = 64

The highest coefficient less than 7 we can multiply this by to stay under 86 is 1

Multiplying this coefficient by our original value, we get: 1 * 64 = 64

Add our new value to our running total, we get:
0 + 64 = 64

This is <= 86, so we assign our outside coefficient of 1 for this digit.

Our new sum becomes 64

Our octal notation is now equal to 1

##### 81 = 8

The highest coefficient less than 7 we can multiply this by to stay under 86 is 2

Multiplying this coefficient by our original value, we get: 2 * 8 = 16

Add our new value to our running total, we get:
64 + 16 = 80

This is <= 86, so we assign our outside coefficient of 2 for this digit.

Our new sum becomes 80

Our octal notation is now equal to 12

##### 80 = 1

The highest coefficient less than 7 we can multiply this by to stay under 86 is 6

Multiplying this coefficient by our original value, we get: 6 * 1 = 6

Add our new value to our running total, we get:
80 + 6 = 86

This = 86, so we assign our outside coefficient of 6 for this digit.

Our new sum becomes 86

Our octal notation is now equal to 126