13904729 ÷ 642 
Our goal is to divide 13904729 by 642.

Let's proceed to step 1:
The number 642 fits into 1 0 times, leaving a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Grab the next digit (3) from the dividend, add it to 1, then carry on: 13 / 642

On to step 2:
642 can be fit into 13 0 times, resulting in a remainder of 13.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 13 and we're left with 13.
Grab the next digit (9) from the dividend, add it to 13, then carry on: 139 / 642

Going ahead to step 3:
642 can be fit into 139 0 times, resulting in a remainder of 139.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 139 to get 139.
Bring next digit (0) of the dividend behind the 139 and repeat the process: 1390 / 642

Moving on to step 4:
642 goes into 1390 2 times with a remainder of 106.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we subtract 1284 from 1390, we get 106.
Fetch the next digit (4) from the dividend, attach it to 106 and continue: 1064 / 642

Advancing to step 5:
If we divide 1064 by 642, we get 1 and a remainder of 422.
Write down 1 as next digit of the result. 
Result so far: 21.0
The remainder is 422 after subtracting 642 from 1064.
Fetch the next digit (7) from the dividend, attach it to 422 and continue: 4227 / 642

Step 6:
642 goes into 4227 6 times with a remainder of 375.
The number 6 becomes the next digit in our result. 
Result so far: 216.0
The remainder is 375 after subtracting 3852 from 4227.
Take the next digit (2) from the dividend and append it to 375, then repeat: 3752 / 642

Going ahead to step 7:
642 goes into 3752 5 times with a remainder of 542.
Write down 5 as next digit of the result. 
Result so far: 2165.0
Deduct 3210 from 3752 and we're left with 542.
Take the next digit (9) from the dividend and append it to 542, then repeat: 5429 / 642

Step 8:
642 can be fit into 5429 8 times, resulting in a remainder of 293.
Put 8 as the next digit of the answer. 
Result so far: 21658.0
The remainder is 293 after subtracting 5136 from 5429.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2930, and continue the process.

Moving on to step 9:
When dividing 2930 by 642, we get 4 with a remainder of 362.
The next digit of our result is 4. 
Result so far: 21658.4
If we subtract 2568 from 2930, we get 362.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3620, and continue the process.

Going ahead to step 10:
If we divide 3620 by 642, we get 5 and a remainder of 410.
Use 5 as the next digit of our solution. 
Result so far: 21658.45
Subtracting 3210 from 3620 leaves us with 410.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4100, and continue the process.

On to step 11:
If we divide 4100 by 642, we get 6 and a remainder of 248.
The number 6 becomes the next digit in our result. 
Result so far: 21658.456
If we take 3852 away from 4100, we end up with 248.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2480, and continue the process.

Advancing to step 12:
2480 divided by 642 is 3 with a remainder of 554.
Record the quotient 3 as the next digit in the result. 
Result so far: 21658.4563
Subtract 1926 from 2480 to get 554.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5540, and continue the process.

Going ahead to step 13:
5540 divided by 642 is 8 with a remainder of 404.
The number 8 becomes the next digit in our result. 
Result so far: 21658.45638
Subtracting 5136 from 5540 leaves us with 404.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4040, and continue the process.

Let's proceed to step 14:
If we divide 4040 by 642, we get 6 and a remainder of 188.
Write down 6 as next digit of the result. 
Result so far: 21658.456386
Subtract 3852 from 4040 to get 188.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1880, and continue the process.

Going ahead to step 15:
642 can be fit into 1880 2 times, resulting in a remainder of 596.
Write down 2 as next digit of the result. 
Result so far: 21658.4563862
If we subtract 1284 from 1880, we get 596.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5960, and continue the process.

Advancing to step 16:
The number 642 fits into 5960 9 times, leaving a remainder of 182.
Use 9 as the next digit of our solution. 
Result so far: 21658.45638629
Subtracting 5778 from 5960 leaves us with 182.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1820, and continue the process.

The final result is 21658.45638629 with a remainder of 1.82e-07.