We look at the division of 15357111 by 243 
We're looking to find how many times 243 goes into 15357111.

Step 1:
The number 243 fits into 1 0 times, leaving a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Grab the next digit (5) from the dividend, add it to 1, then carry on: 15 / 243

Moving on to step 2:
243 can be fit into 15 0 times, resulting in a remainder of 15.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 15 leaves us with 15.
Take the next digit (3) from the dividend and append it to 15, then repeat: 153 / 243

Going ahead to step 3:
If we divide 153 by 243, we get 0 and a remainder of 153.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 153 leaves us with 153.
Append the next digit (5) from the dividend to 153 and continue with: 1535 / 243

Advancing to step 4:
If we divide 1535 by 243, we get 6 and a remainder of 77.
Use 6 as the next digit of our solution. 
Result so far: 6.0
Deduct 1458 from 1535 and we're left with 77.
Bring next digit (7) of the dividend behind the 77 and repeat the process: 777 / 243

Step 5:
When dividing 777 by 243, we get 3 with a remainder of 48.
Write down 3 as next digit of the result. 
Result so far: 63.0
Subtracting 729 from 777 leaves us with 48.
Append the next digit (1) from the dividend to 48 and continue with: 481 / 243

Advancing to step 6:
The number 243 fits into 481 1 times, leaving a remainder of 238.
The next digit of our result is 1. 
Result so far: 631.0
Subtract 243 from 481 to get 238.
Append the next digit (1) from the dividend to 238 and continue with: 2381 / 243

Moving on to step 7:
243 goes into 2381 9 times with a remainder of 194.
The next digit of our result is 9. 
Result so far: 6319.0
Subtracting 2187 from 2381 leaves us with 194.
Include the next digit (1) from the dividend after 194, then repeat: 1941 / 243

Moving on to step 8:
243 goes into 1941 7 times with a remainder of 240.
Record the quotient 7 as the next digit in the result. 
Result so far: 63197.0
Subtract 1701 from 1941 to get 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

On to step 9:
The number 243 fits into 2400 9 times, leaving a remainder of 213.
The next digit of our result is 9. 
Result so far: 63197.9
Subtract 2187 from 2400 to get 213.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2130, and continue the process.

Advancing to step 10:
The number 243 fits into 2130 8 times, leaving a remainder of 186.
Put 8 as the next digit of the answer. 
Result so far: 63197.98
Subtracting 1944 from 2130 leaves us with 186.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1860, and continue the process.

Advancing to step 11:
When dividing 1860 by 243, we get 7 with a remainder of 159.
Put 7 as the next digit of the answer. 
Result so far: 63197.987
Subtracting 1701 from 1860 leaves us with 159.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1590, and continue the process.

Advancing to step 12:
The number 243 fits into 1590 6 times, leaving a remainder of 132.
The next digit of our result is 6. 
Result so far: 63197.9876
The remainder is 132 after subtracting 1458 from 1590.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1320, and continue the process.

Advancing to step 13:
243 goes into 1320 5 times with a remainder of 105.
Record the quotient 5 as the next digit in the result. 
Result so far: 63197.98765
Deduct 1215 from 1320 and we're left with 105.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1050, and continue the process.

Moving on to step 14:
1050 divided by 243 is 4 with a remainder of 78.
Record the quotient 4 as the next digit in the result. 
Result so far: 63197.987654
Subtracting 972 from 1050 leaves us with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Advancing to step 15:
243 goes into 780 3 times with a remainder of 51.
The next digit of our result is 3. 
Result so far: 63197.9876543
Subtract 729 from 780 to get 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Going ahead to step 16:
243 can be fit into 510 2 times, resulting in a remainder of 24.
Use 2 as the next digit of our solution. 
Result so far: 63197.98765432
Subtracting 486 from 510 leaves us with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

The final result is 63197.98765432 with a remainder of 2.4e-08.