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Convert 172 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 >= 172

8⁰ = 1

8¹ = 8

8² = 64

8³ = 512 <--- Stop: This is greater than 172

Since 512 is greater than 172, 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 172 is 2

Multiplying this coefficient by our original value, we get: 2 * 64 = 128

Add our new value to our running total, we get:
0 + 128 = 128

This is <= 172, so we assign our outside coefficient of 2 for this digit.

Our new sum becomes 128

Our octal notation is now equal to 2

8¹ = 8

The highest coefficient less than 7 we can multiply this by to stay under 172 is 5

Multiplying this coefficient by our original value, we get: 5 * 8 = 40

Add our new value to our running total, we get:
128 + 40 = 168

This is <= 172, so we assign our outside coefficient of 5 for this digit.

Our new sum becomes 168

Our octal notation is now equal to 25

8⁰ = 1

The highest coefficient less than 7 we can multiply this by to stay under 172 is 4

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

Add our new value to our running total, we get:
168 + 4 = 172

This = 172, so we assign our outside coefficient of 4 for this digit.

Our new sum becomes 172

Our octal notation is now equal to 254

Final Answer