400251 ÷ 81 
We're looking to find how many times 81 goes into 400251.

On to step 1:
When dividing 4 by 81, we get 0 with a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Take the next digit (0) from the dividend and append it to 4, then repeat: 40 / 81

Step 2:
When dividing 40 by 81, we get 0 with a remainder of 40.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 40 after subtracting 0 from 40.
Fetch the next digit (0) from the dividend, attach it to 40 and continue: 400 / 81

On to step 3:
If we divide 400 by 81, we get 4 and a remainder of 76.
Write down 4 as next digit of the result. 
Result so far: 4.0
Subtracting 324 from 400 leaves us with 76.
Fetch the next digit (2) from the dividend, attach it to 76 and continue: 762 / 81

Going ahead to step 4:
If we divide 762 by 81, we get 9 and a remainder of 33.
Put 9 as the next digit of the answer. 
Result so far: 49.0
Subtract 729 from 762 to get 33.
Bring next digit (5) of the dividend behind the 33 and repeat the process: 335 / 81

On to step 5:
81 goes into 335 4 times with a remainder of 11.
Write down 4 as next digit of the result. 
Result so far: 494.0
Subtracting 324 from 335 leaves us with 11.
Include the next digit (1) from the dividend after 11, then repeat: 111 / 81

Let's proceed to step 6:
81 goes into 111 1 times with a remainder of 30.
The number 1 becomes the next digit in our result. 
Result so far: 4941.0
If we take 81 away from 111, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 7:
81 goes into 300 3 times with a remainder of 57.
Use 3 as the next digit of our solution. 
Result so far: 4941.3
Subtract 243 from 300 to get 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Advancing to step 8:
81 can be fit into 570 7 times, resulting in a remainder of 3.
Write down 7 as next digit of the result. 
Result so far: 4941.37
Subtracting 567 from 570 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 9:
81 can be fit into 30 0 times, resulting in a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 4941.37
If we subtract 0 from 30, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Advancing to step 10:
The number 81 fits into 300 3 times, leaving a remainder of 57.
The number 3 becomes the next digit in our result. 
Result so far: 4941.3703
The remainder is 57 after subtracting 243 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Going ahead to step 11:
If we divide 570 by 81, we get 7 and a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 4941.37037
Deduct 567 from 570 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 12:
The number 81 fits into 30 0 times, leaving a remainder of 30.
The number 0 becomes the next digit in our result. 
Result so far: 4941.37037
The remainder is 30 after subtracting 0 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 13:
When dividing 300 by 81, we get 3 with a remainder of 57.
Put 3 as the next digit of the answer. 
Result so far: 4941.3703703
Subtracting 243 from 300 leaves us with 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Going ahead to step 14:
The number 81 fits into 570 7 times, leaving a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 4941.37037037
The remainder is 3 after subtracting 567 from 570.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

The quotient of the division is 4941.37037037, and the remainder is 3e-09.