We look at the division of 40345486 by 421 
We're looking to find how many times 421 goes into 40345486.

Step 1:
421 can be fit into 4 0 times, resulting in a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Include the next digit (0) from the dividend after 4, then repeat: 40 / 421

Moving on to step 2:
If we divide 40 by 421, we get 0 and a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 40 and we're left with 40.
Append the next digit (3) from the dividend to 40 and continue with: 403 / 421

Going ahead to step 3:
The number 421 fits into 403 0 times, leaving a remainder of 403.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 403 and we're left with 403.
Include the next digit (4) from the dividend after 403, then repeat: 4034 / 421

On to step 4:
421 goes into 4034 9 times with a remainder of 245.
The number 9 becomes the next digit in our result. 
Result so far: 9.0
The remainder is 245 after subtracting 3789 from 4034.
Take the next digit (5) from the dividend and append it to 245, then repeat: 2455 / 421

Step 5:
The number 421 fits into 2455 5 times, leaving a remainder of 350.
Use 5 as the next digit of our solution. 
Result so far: 95.0
Subtract 2105 from 2455 to get 350.
Include the next digit (4) from the dividend after 350, then repeat: 3504 / 421

Going ahead to step 6:
421 can be fit into 3504 8 times, resulting in a remainder of 136.
Use 8 as the next digit of our solution. 
Result so far: 958.0
If we subtract 3368 from 3504, we get 136.
Take the next digit (8) from the dividend and append it to 136, then repeat: 1368 / 421

On to step 7:
421 can be fit into 1368 3 times, resulting in a remainder of 105.
Record the quotient 3 as the next digit in the result. 
Result so far: 9583.0
Subtract 1263 from 1368 to get 105.
Bring next digit (6) of the dividend behind the 105 and repeat the process: 1056 / 421

On to step 8:
If we divide 1056 by 421, we get 2 and a remainder of 214.
Write down 2 as next digit of the result. 
Result so far: 95832.0
If we take 842 away from 1056, we end up with 214.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2140, and continue the process.

Moving on to step 9:
If we divide 2140 by 421, we get 5 and a remainder of 35.
Use 5 as the next digit of our solution. 
Result so far: 95832.5
The remainder is 35 after subtracting 2105 from 2140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Let's proceed to step 10:
421 can be fit into 350 0 times, resulting in a remainder of 350.
Put 0 as the next digit of the answer. 
Result so far: 95832.5
If we take 0 away from 350, we end up with 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3500, and continue the process.

Moving on to step 11:
421 can be fit into 3500 8 times, resulting in a remainder of 132.
Use 8 as the next digit of our solution. 
Result so far: 95832.508
The remainder is 132 after subtracting 3368 from 3500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1320, and continue the process.

Going ahead to step 12:
421 can be fit into 1320 3 times, resulting in a remainder of 57.
Put 3 as the next digit of the answer. 
Result so far: 95832.5083
If we take 1263 away from 1320, we end up 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.

Let's proceed to step 13:
421 can be fit into 570 1 times, resulting in a remainder of 149.
The number 1 becomes the next digit in our result. 
Result so far: 95832.50831
If we take 421 away from 570, we end up with 149.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1490, and continue the process.

Advancing to step 14:
The number 421 fits into 1490 3 times, leaving a remainder of 227.
Use 3 as the next digit of our solution. 
Result so far: 95832.508313
Deduct 1263 from 1490 and we're left with 227.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2270, and continue the process.

Advancing to step 15:
The number 421 fits into 2270 5 times, leaving a remainder of 165.
Use 5 as the next digit of our solution. 
Result so far: 95832.5083135
The remainder is 165 after subtracting 2105 from 2270.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1650, and continue the process.

On to step 16:
If we divide 1650 by 421, we get 3 and a remainder of 387.
Write down 3 as next digit of the result. 
Result so far: 95832.50831353
If we take 1263 away from 1650, we end up with 387.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3870, and continue the process.

Our division results in 95832.50831353 with a remaining 3.87e-07.