19842347 ÷ 644 
We want to figure out the number of times 19842347 can be divided by 644.

Step 1:
The number 644 fits into 1 0 times, leaving a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Fetch the next digit (9) from the dividend, attach it to 1 and continue: 19 / 644

Step 2:
The number 644 fits into 19 0 times, leaving a remainder of 19.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 19 to get 19.
Grab the next digit (8) from the dividend, add it to 19, then carry on: 198 / 644

Advancing to step 3:
644 can be fit into 198 0 times, resulting in a remainder of 198.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 198 after subtracting 0 from 198.
Take the next digit (4) from the dividend and append it to 198, then repeat: 1984 / 644

Going ahead to step 4:
644 goes into 1984 3 times with a remainder of 52.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
Subtract 1932 from 1984 to get 52.
Include the next digit (2) from the dividend after 52, then repeat: 522 / 644

On to step 5:
522 divided by 644 is 0 with a remainder of 522.
Put 0 as the next digit of the answer. 
Result so far: 30.0
If we take 0 away from 522, we end up with 522.
Grab the next digit (3) from the dividend, add it to 522, then carry on: 5223 / 644

Advancing to step 6:
When dividing 5223 by 644, we get 8 with a remainder of 71.
The next digit of our result is 8. 
Result so far: 308.0
Subtract 5152 from 5223 to get 71.
Bring next digit (4) of the dividend behind the 71 and repeat the process: 714 / 644

Moving on to step 7:
714 divided by 644 is 1 with a remainder of 70.
Record the quotient 1 as the next digit in the result. 
Result so far: 3081.0
If we subtract 644 from 714, we get 70.
Fetch the next digit (7) from the dividend, attach it to 70 and continue: 707 / 644

Step 8:
707 divided by 644 is 1 with a remainder of 63.
The number 1 becomes the next digit in our result. 
Result so far: 30811.0
Subtract 644 from 707 to get 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

On to step 9:
644 can be fit into 630 0 times, resulting in a remainder of 630.
The number 0 becomes the next digit in our result. 
Result so far: 30811.0
The remainder is 630 after subtracting 0 from 630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6300, and continue the process.

Going ahead to step 10:
If we divide 6300 by 644, we get 9 and a remainder of 504.
Use 9 as the next digit of our solution. 
Result so far: 30811.09
If we take 5796 away from 6300, we end up with 504.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5040, and continue the process.

On to step 11:
5040 divided by 644 is 7 with a remainder of 532.
Record the quotient 7 as the next digit in the result. 
Result so far: 30811.097
Subtract 4508 from 5040 to get 532.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5320, and continue the process.

Going ahead to step 12:
The number 644 fits into 5320 8 times, leaving a remainder of 168.
Record the quotient 8 as the next digit in the result. 
Result so far: 30811.0978
Deduct 5152 from 5320 and we're left with 168.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1680, and continue the process.

Going ahead to step 13:
1680 divided by 644 is 2 with a remainder of 392.
Use 2 as the next digit of our solution. 
Result so far: 30811.09782
If we subtract 1288 from 1680, we get 392.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3920, and continue the process.

Step 14:
3920 divided by 644 is 6 with a remainder of 56.
Write down 6 as next digit of the result. 
Result so far: 30811.097826
Deduct 3864 from 3920 and we're left with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Advancing to step 15:
If we divide 560 by 644, we get 0 and a remainder of 560.
Use 0 as the next digit of our solution. 
Result so far: 30811.097826
Deduct 0 from 560 and we're left with 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5600, and continue the process.

Moving on to step 16:
When dividing 5600 by 644, we get 8 with a remainder of 448.
Record the quotient 8 as the next digit in the result. 
Result so far: 30811.09782608
Subtract 5152 from 5600 to get 448.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4480, and continue the process.

The final result is 30811.09782608 with a remainder of 4.48e-07.