51237656 ÷ 243 
Let's see how many times 243 fits into 51237656.

Advancing to step 1:
When dividing 5 by 243, we get 0 with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Take the next digit (1) from the dividend and append it to 5, then repeat: 51 / 243

On to step 2:
243 can be fit into 51 0 times, resulting in a remainder of 51.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 51 and we're left with 51.
Fetch the next digit (2) from the dividend, attach it to 51 and continue: 512 / 243

Advancing to step 3:
When dividing 512 by 243, we get 2 with a remainder of 26.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Deduct 486 from 512 and we're left with 26.
Include the next digit (3) from the dividend after 26, then repeat: 263 / 243

On to step 4:
When dividing 263 by 243, we get 1 with a remainder of 20.
Put 1 as the next digit of the answer. 
Result so far: 21.0
Subtracting 243 from 263 leaves us with 20.
Grab the next digit (7) from the dividend, add it to 20, then carry on: 207 / 243

Going ahead to step 5:
When dividing 207 by 243, we get 0 with a remainder of 207.
Write down 0 as next digit of the result. 
Result so far: 210.0
Subtracting 0 from 207 leaves us with 207.
Include the next digit (6) from the dividend after 207, then repeat: 2076 / 243

Step 6:
243 goes into 2076 8 times with a remainder of 132.
The number 8 becomes the next digit in our result. 
Result so far: 2108.0
The remainder is 132 after subtracting 1944 from 2076.
Grab the next digit (5) from the dividend, add it to 132, then carry on: 1325 / 243

Going ahead to step 7:
243 goes into 1325 5 times with a remainder of 110.
Put 5 as the next digit of the answer. 
Result so far: 21085.0
Subtracting 1215 from 1325 leaves us with 110.
Fetch the next digit (6) from the dividend, attach it to 110 and continue: 1106 / 243

Going ahead to step 8:
The number 243 fits into 1106 4 times, leaving a remainder of 134.
The number 4 becomes the next digit in our result. 
Result so far: 210854.0
The remainder is 134 after subtracting 972 from 1106.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1340, and continue the process.

On to step 9:
If we divide 1340 by 243, we get 5 and a remainder of 125.
Write down 5 as next digit of the result. 
Result so far: 210854.5
Subtracting 1215 from 1340 leaves us with 125.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

Let's proceed to step 10:
If we divide 1250 by 243, we get 5 and a remainder of 35.
Put 5 as the next digit of the answer. 
Result so far: 210854.55
Subtracting 1215 from 1250 leaves us with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

The quotient of the division is 210854.55, and the remainder is 0.035.