121906 ÷ 3 
We want to divide 121906 by 3.

Let's proceed to step 1:
3 can be fit into 1 0 times, resulting in a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Append the next digit (2) from the dividend to 1 and continue with: 12 / 3

Moving on to step 2:
If we divide 12 by 3, we get 4 and a remainder of 0.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
If we take 12 away from 12, we end up with 0.
Include the next digit (1) from the dividend after 0, then repeat: 1 / 3

Step 3:
1 divided by 3 is 0 with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 40.0
The remainder is 1 after subtracting 0 from 1.
Include the next digit (9) from the dividend after 1, then repeat: 19 / 3

Moving on to step 4:
When dividing 19 by 3, we get 6 with a remainder of 1.
The number 6 becomes the next digit in our result. 
Result so far: 406.0
If we subtract 18 from 19, we get 1.
Grab the next digit (0) from the dividend, add it to 1, then carry on: 10 / 3

Going ahead to step 5:
If we divide 10 by 3, we get 3 and a remainder of 1.
The next digit of our result is 3. 
Result so far: 4063.0
Subtracting 9 from 10 leaves us with 1.
Bring next digit (6) of the dividend behind the 1 and repeat the process: 16 / 3

Step 6:
16 divided by 3 is 5 with a remainder of 1.
Put 5 as the next digit of the answer. 
Result so far: 40635.0
Deduct 15 from 16 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 7:
If we divide 10 by 3, we get 3 and a remainder of 1.
The next digit of our result is 3. 
Result so far: 40635.3
Subtract 9 from 10 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Moving on to step 8:
The number 3 fits into 10 3 times, leaving a remainder of 1.
Use 3 as the next digit of our solution. 
Result so far: 40635.33
Deduct 9 from 10 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

The final outcome is 40635.33, with a leftover of 0.001.