51799241 ÷ 646 
We want to figure out the number of times 51799241 can be divided by 646.

Moving on to step 1:
If we divide 5 by 646, we get 0 and a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Bring next digit (1) of the dividend behind the 5 and repeat the process: 51 / 646

Advancing to step 2:
646 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.
Bring next digit (7) of the dividend behind the 51 and repeat the process: 517 / 646

Step 3:
If we divide 517 by 646, we get 0 and a remainder of 517.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 517, we get 517.
Fetch the next digit (9) from the dividend, attach it to 517 and continue: 5179 / 646

Advancing to step 4:
The number 646 fits into 5179 8 times, leaving a remainder of 11.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
If we subtract 5168 from 5179, we get 11.
Append the next digit (9) from the dividend to 11 and continue with: 119 / 646

Step 5:
The number 646 fits into 119 0 times, leaving a remainder of 119.
The number 0 becomes the next digit in our result. 
Result so far: 80.0
Deduct 0 from 119 and we're left with 119.
Append the next digit (2) from the dividend to 119 and continue with: 1192 / 646

On to step 6:
The number 646 fits into 1192 1 times, leaving a remainder of 546.
The next digit of our result is 1. 
Result so far: 801.0
Subtract 646 from 1192 to get 546.
Include the next digit (4) from the dividend after 546, then repeat: 5464 / 646

On to step 7:
5464 divided by 646 is 8 with a remainder of 296.
Write down 8 as next digit of the result. 
Result so far: 8018.0
The remainder is 296 after subtracting 5168 from 5464.
Include the next digit (1) from the dividend after 296, then repeat: 2961 / 646

Let's proceed to step 8:
646 can be fit into 2961 4 times, resulting in a remainder of 377.
Use 4 as the next digit of our solution. 
Result so far: 80184.0
Subtracting 2584 from 2961 leaves us with 377.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3770, and continue the process.

Moving on to step 9:
3770 divided by 646 is 5 with a remainder of 540.
Use 5 as the next digit of our solution. 
Result so far: 80184.5
If we take 3230 away from 3770, we end up with 540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5400, and continue the process.

Advancing to step 10:
646 can be fit into 5400 8 times, resulting in a remainder of 232.
Record the quotient 8 as the next digit in the result. 
Result so far: 80184.58
If we subtract 5168 from 5400, we get 232.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2320, and continue the process.

Going ahead to step 11:
2320 divided by 646 is 3 with a remainder of 382.
Put 3 as the next digit of the answer. 
Result so far: 80184.583
Subtract 1938 from 2320 to get 382.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3820, and continue the process.

Going ahead to step 12:
The number 646 fits into 3820 5 times, leaving a remainder of 590.
Use 5 as the next digit of our solution. 
Result so far: 80184.5835
Subtract 3230 from 3820 to get 590.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5900, and continue the process.

Let's proceed to step 13:
If we divide 5900 by 646, we get 9 and a remainder of 86.
Use 9 as the next digit of our solution. 
Result so far: 80184.58359
Deduct 5814 from 5900 and we're left with 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Let's proceed to step 14:
If we divide 860 by 646, we get 1 and a remainder of 214.
The next digit of our result is 1. 
Result so far: 80184.583591
If we take 646 away from 860, we end up with 214.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2140, and continue the process.

Going ahead to step 15:
When dividing 2140 by 646, we get 3 with a remainder of 202.
Put 3 as the next digit of the answer. 
Result so far: 80184.5835913
The remainder is 202 after subtracting 1938 from 2140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2020, and continue the process.

Moving on to step 16:
646 goes into 2020 3 times with a remainder of 82.
Put 3 as the next digit of the answer. 
Result so far: 80184.58359133
Deduct 1938 from 2020 and we're left with 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

The final result is 80184.58359133 with a remainder of 8.2e-08.