We look at the division of 52181121 by 415 
Let's see how many times 415 fits into 52181121.

Step 1:
If we divide 5 by 415, we get 0 and a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Include the next digit (2) from the dividend after 5, then repeat: 52 / 415

On to step 2:
The number 415 fits into 52 0 times, leaving a remainder of 52.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 52, we end up with 52.
Take the next digit (1) from the dividend and append it to 52, then repeat: 521 / 415

Step 3:
The number 415 fits into 521 1 times, leaving a remainder of 106.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 415 from 521, we get 106.
Fetch the next digit (8) from the dividend, attach it to 106 and continue: 1068 / 415

Advancing to step 4:
If we divide 1068 by 415, we get 2 and a remainder of 238.
Use 2 as the next digit of our solution. 
Result so far: 12.0
The remainder is 238 after subtracting 830 from 1068.
Bring next digit (1) of the dividend behind the 238 and repeat the process: 2381 / 415

On to step 5:
415 can be fit into 2381 5 times, resulting in a remainder of 306.
Put 5 as the next digit of the answer. 
Result so far: 125.0
Deduct 2075 from 2381 and we're left with 306.
Append the next digit (1) from the dividend to 306 and continue with: 3061 / 415

Moving on to step 6:
415 can be fit into 3061 7 times, resulting in a remainder of 156.
Use 7 as the next digit of our solution. 
Result so far: 1257.0
The remainder is 156 after subtracting 2905 from 3061.
Append the next digit (2) from the dividend to 156 and continue with: 1562 / 415

Advancing to step 7:
When dividing 1562 by 415, we get 3 with a remainder of 317.
The number 3 becomes the next digit in our result. 
Result so far: 12573.0
If we take 1245 away from 1562, we end up with 317.
Grab the next digit (1) from the dividend, add it to 317, then carry on: 3171 / 415

On to step 8:
415 goes into 3171 7 times with a remainder of 266.
Record the quotient 7 as the next digit in the result. 
Result so far: 125737.0
Subtract 2905 from 3171 to get 266.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2660, and continue the process.

Step 9:
When dividing 2660 by 415, we get 6 with a remainder of 170.
Put 6 as the next digit of the answer. 
Result so far: 125737.6
The remainder is 170 after subtracting 2490 from 2660.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

Advancing to step 10:
The number 415 fits into 1700 4 times, leaving a remainder of 40.
Use 4 as the next digit of our solution. 
Result so far: 125737.64
If we subtract 1660 from 1700, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Moving on to step 11:
The number 415 fits into 400 0 times, leaving a remainder of 400.
Put 0 as the next digit of the answer. 
Result so far: 125737.64
Subtracting 0 from 400 leaves us with 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

On to step 12:
When dividing 4000 by 415, we get 9 with a remainder of 265.
Record the quotient 9 as the next digit in the result. 
Result so far: 125737.6409
If we subtract 3735 from 4000, we get 265.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2650, and continue the process.

Going ahead to step 13:
If we divide 2650 by 415, we get 6 and a remainder of 160.
The next digit of our result is 6. 
Result so far: 125737.64096
Subtracting 2490 from 2650 leaves us with 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Step 14:
When dividing 1600 by 415, we get 3 with a remainder of 355.
Record the quotient 3 as the next digit in the result. 
Result so far: 125737.640963
The remainder is 355 after subtracting 1245 from 1600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3550, and continue the process.

Step 15:
415 can be fit into 3550 8 times, resulting in a remainder of 230.
Use 8 as the next digit of our solution. 
Result so far: 125737.6409638
Subtracting 3320 from 3550 leaves us with 230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2300, and continue the process.

On to step 16:
When dividing 2300 by 415, we get 5 with a remainder of 225.
Put 5 as the next digit of the answer. 
Result so far: 125737.64096385
If we subtract 2075 from 2300, we get 225.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2250, and continue the process.

The final outcome is 125737.64096385, with a leftover of 2.25e-07.