Let's divide 53115425 by 243
We want to divide 53115425 by 243.

Moving on to step 1:
If we divide 5 by 243, we get 0 and a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Include the next digit (3) from the dividend after 5, then repeat: 53 / 243

Going ahead to step 2:
When dividing 53 by 243, we get 0 with a remainder of 53.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 53 and we're left with 53.
Take the next digit (1) from the dividend and append it to 53, then repeat: 531 / 243

Let's proceed to step 3:
243 can be fit into 531 2 times, resulting in a remainder of 45.
The next digit of our result is 2. 
Result so far: 2.0
If we subtract 486 from 531, we get 45.
Fetch the next digit (1) from the dividend, attach it to 45 and continue: 451 / 243

Moving on to step 4:
243 can be fit into 451 1 times, resulting in a remainder of 208.
The number 1 becomes the next digit in our result. 
Result so far: 21.0
If we take 243 away from 451, we end up with 208.
Fetch the next digit (5) from the dividend, attach it to 208 and continue: 2085 / 243

Going ahead to step 5:
243 can be fit into 2085 8 times, resulting in a remainder of 141.
Use 8 as the next digit of our solution. 
Result so far: 218.0
Subtract 1944 from 2085 to get 141.
Bring next digit (4) of the dividend behind the 141 and repeat the process: 1414 / 243

Let's proceed to step 6:
When dividing 1414 by 243, we get 5 with a remainder of 199.
Put 5 as the next digit of the answer. 
Result so far: 2185.0
Subtracting 1215 from 1414 leaves us with 199.
Bring next digit (2) of the dividend behind the 199 and repeat the process: 1992 / 243

Going ahead to step 7:
The number 243 fits into 1992 8 times, leaving a remainder of 48.
Write down 8 as next digit of the result. 
Result so far: 21858.0
Subtract 1944 from 1992 to get 48.
Append the next digit (5) from the dividend to 48 and continue with: 485 / 243

Step 8:
If we divide 485 by 243, we get 1 and a remainder of 242.
Write down 1 as next digit of the result. 
Result so far: 218581.0
Deduct 243 from 485 and we're left with 242.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2420, and continue the process.

Going ahead to step 9:
2420 divided by 243 is 9 with a remainder of 233.
The next digit of our result is 9. 
Result so far: 218581.9
Deduct 2187 from 2420 and we're left with 233.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2330, and continue the process.

On to step 10:
243 can be fit into 2330 9 times, resulting in a remainder of 143.
Record the quotient 9 as the next digit in the result. 
Result so far: 218581.99
Subtracting 2187 from 2330 leaves us with 143.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1430, and continue the process.

The quotient of the division is 218581.99, and the remainder is 0.143.