We divide 400951 by 3
We're looking to find how many times 3 goes into 400951.

Going ahead to step 1:
3 can be fit into 4 1 times, resulting in a remainder of 1.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 3 from 4, we get 1.
Grab the next digit (0) from the dividend, add it to 1, then carry on: 10 / 3

Advancing to step 2:
When dividing 10 by 3, we get 3 with a remainder of 1.
Put 3 as the next digit of the answer. 
Result so far: 13.0
If we take 9 away from 10, we end up with 1.
Append the next digit (0) from the dividend to 1 and continue with: 10 / 3

Moving on to step 3:
3 can be fit into 10 3 times, resulting in a remainder of 1.
Use 3 as the next digit of our solution. 
Result so far: 133.0
Deduct 9 from 10 and we're left with 1.
Take the next digit (9) from the dividend and append it to 1, then repeat: 19 / 3

Going ahead to step 4:
If we divide 19 by 3, we get 6 and a remainder of 1.
Put 6 as the next digit of the answer. 
Result so far: 1336.0
Deduct 18 from 19 and we're left with 1.
Bring next digit (5) of the dividend behind the 1 and repeat the process: 15 / 3

Step 5:
The number 3 fits into 15 5 times, leaving a remainder of 0.
The next digit of our result is 5. 
Result so far: 13365.0
Subtracting 15 from 15 leaves us with 0.
Grab the next digit (1) from the dividend, add it to 0, then carry on: 1 / 3

Let's proceed to step 6:
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: 133650.0
If we subtract 0 from 1, we 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.

Let's proceed to step 7:
3 goes into 10 3 times with a remainder of 1.
Write down 3 as next digit of the result. 
Result so far: 133650.3
If we subtract 9 from 10, we 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.

Step 8:
3 goes into 10 3 times with a remainder of 1.
The next digit of our result is 3. 
Result so far: 133650.33
Subtracting 9 from 10 leaves us 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.

Our division results in 133650.33 with a remaining 0.001.