51231917 ÷ 948 
We want to figure out the number of times 51231917 can be divided by 948.

Going ahead to step 1:
948 goes into 5 0 times with a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Append the next digit (1) from the dividend to 5 and continue with: 51 / 948

Advancing to step 2:
948 goes into 51 0 times with a remainder of 51.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 51, we get 51.
Append the next digit (2) from the dividend to 51 and continue with: 512 / 948

Let's proceed to step 3:
If we divide 512 by 948, we get 0 and a remainder of 512.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 512, we get 512.
Fetch the next digit (3) from the dividend, attach it to 512 and continue: 5123 / 948

Step 4:
When dividing 5123 by 948, we get 5 with a remainder of 383.
Use 5 as the next digit of our solution. 
Result so far: 5.0
If we subtract 4740 from 5123, we get 383.
Fetch the next digit (1) from the dividend, attach it to 383 and continue: 3831 / 948

Let's proceed to step 5:
948 goes into 3831 4 times with a remainder of 39.
The number 4 becomes the next digit in our result. 
Result so far: 54.0
Deduct 3792 from 3831 and we're left with 39.
Append the next digit (9) from the dividend to 39 and continue with: 399 / 948

Moving on to step 6:
948 goes into 399 0 times with a remainder of 399.
The next digit of our result is 0. 
Result so far: 540.0
The remainder is 399 after subtracting 0 from 399.
Grab the next digit (1) from the dividend, add it to 399, then carry on: 3991 / 948

Going ahead to step 7:
If we divide 3991 by 948, we get 4 and a remainder of 199.
Put 4 as the next digit of the answer. 
Result so far: 5404.0
Subtracting 3792 from 3991 leaves us with 199.
Take the next digit (7) from the dividend and append it to 199, then repeat: 1997 / 948

Going ahead to step 8:
When dividing 1997 by 948, we get 2 with a remainder of 101.
Put 2 as the next digit of the answer. 
Result so far: 54042.0
The remainder is 101 after subtracting 1896 from 1997.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1010, and continue the process.

Moving on to step 9:
The number 948 fits into 1010 1 times, leaving a remainder of 62.
Record the quotient 1 as the next digit in the result. 
Result so far: 54042.1
Deduct 948 from 1010 and we're left with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Moving on to step 10:
If we divide 620 by 948, we get 0 and a remainder of 620.
The number 0 becomes the next digit in our result. 
Result so far: 54042.1
Deduct 0 from 620 and we're left with 620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6200, and continue the process.

Going ahead to step 11:
6200 divided by 948 is 6 with a remainder of 512.
The number 6 becomes the next digit in our result. 
Result so far: 54042.106
Subtract 5688 from 6200 to get 512.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5120, and continue the process.

Going ahead to step 12:
948 can be fit into 5120 5 times, resulting in a remainder of 380.
The next digit of our result is 5. 
Result so far: 54042.1065
If we take 4740 away from 5120, we end up with 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3800, and continue the process.

Going ahead to step 13:
948 goes into 3800 4 times with a remainder of 8.
Record the quotient 4 as the next digit in the result. 
Result so far: 54042.10654
Deduct 3792 from 3800 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 14:
If we divide 80 by 948, we get 0 and a remainder of 80.
Write down 0 as next digit of the result. 
Result so far: 54042.10654
If we subtract 0 from 80, we get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Step 15:
The number 948 fits into 800 0 times, leaving a remainder of 800.
The next digit of our result is 0. 
Result so far: 54042.10654
Subtract 0 from 800 to get 800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8000, and continue the process.

The final outcome is 54042.10654, with a leftover of 8e-06.