We're dividing 400975 by 3 
Our goal is to divide 400975 by 3.

Going ahead to step 1:
4 divided by 3 is 1 with a remainder of 1.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 3 from 4 and we're left with 1.
Append the next digit (0) from the dividend to 1 and continue with: 10 / 3

Moving on to step 2:
3 can be fit into 10 3 times, resulting in a remainder of 1.
Write down 3 as next digit of the result. 
Result so far: 13.0
If we take 9 away from 10, we end up with 1.
Fetch the next digit (0) from the dividend, attach it to 1 and continue: 10 / 3

Moving on to step 3:
10 divided by 3 is 3 with a remainder of 1.
The number 3 becomes the next digit in our result. 
Result so far: 133.0
The remainder is 1 after subtracting 9 from 10.
Fetch the next digit (9) from the dividend, attach it to 1 and continue: 19 / 3

Advancing to step 4:
If we divide 19 by 3, we get 6 and a remainder of 1.
The number 6 becomes the next digit in our result. 
Result so far: 1336.0
Deduct 18 from 19 and we're left with 1.
Take the next digit (7) from the dividend and append it to 1, then repeat: 17 / 3

Advancing to step 5:
17 divided by 3 is 5 with a remainder of 2.
Record the quotient 5 as the next digit in the result. 
Result so far: 13365.0
If we subtract 15 from 17, we get 2.
Grab the next digit (5) from the dividend, add it to 2, then carry on: 25 / 3

Step 6:
When dividing 25 by 3, we get 8 with a remainder of 1.
Put 8 as the next digit of the answer. 
Result so far: 133658.0
Deduct 24 from 25 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:
10 divided by 3 is 3 with a remainder of 1.
Use 3 as the next digit of our solution. 
Result so far: 133658.3
If we take 9 away from 10, we end up 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.

Moving on to step 8:
3 goes into 10 3 times with a remainder of 1.
Put 3 as the next digit of the answer. 
Result so far: 133658.33
If we take 9 away from 10, we end up 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 133658.33 with a remaining 0.001.