 # Base Change Conversions Calculator

<-- Enter Number or Notation that will be converted
Convert Decimal to:
Base:
Convert to Decimal from:

Convert 9 from decimal to binary
(base 2) notation:

## Power Test

Raise our base of 2 to a power
Start at 0 and increasing by 1 until it is >= 9
20 = 1
21 = 2
22 = 4
23 = 8
24 = 16 <--- Stop: This is greater than 9

Since 16 is greater than 9, we use 1 power less as our starting point which equals 3

## Build binary notation

Work backwards from a power of 3

## 23 = 8

The highest coefficient less than 1 we can multiply this by to stay under 9 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 <= 9, so we assign our outside coefficient of 1 for this digit.
Our new sum becomes 8
Our binary notation is now equal to 1

## 22 = 4

The highest coefficient less than 1 we can multiply this by to stay under 9 is 1
Multiplying this coefficient by our original value, we get: 1 * 4 = 4
Add our new value to our running total, we get:
8 + 4 = 12

This is > 9, so we assign a 0 for this digit.
Our total sum remains the same at 8
Our binary notation is now equal to 10

## 21 = 2

The highest coefficient less than 1 we can multiply this by to stay under 9 is 1
Multiplying this coefficient by our original value, we get: 1 * 2 = 2
Add our new value to our running total, we get:
8 + 2 = 10

This is > 9, so we assign a 0 for this digit.
Our total sum remains the same at 8
Our binary notation is now equal to 100

## 20 = 1

The highest coefficient less than 1 we can multiply this by to stay under 9 is 1
Multiplying this coefficient by our original value, we get: 1 * 1 = 1
Add our new value to our running total, we get:
8 + 1 = 9

This = 9, so we assign our outside coefficient of 1 for this digit.
Our new sum becomes 9
Our binary notation is now equal to 1001  