We're dividing 21379716 by 204 
We want to figure out the number of times 21379716 can be divided by 204.

Moving on to step 1:
2 divided by 204 is 0 with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 204

Advancing to step 2:
The number 204 fits into 21 0 times, leaving a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 21, we end up with 21.
Grab the next digit (3) from the dividend, add it to 21, then carry on: 213 / 204

Moving on to step 3:
The number 204 fits into 213 1 times, leaving a remainder of 9.
The next digit of our result is 1. 
Result so far: 1.0
Subtract 204 from 213 to get 9.
Append the next digit (7) from the dividend to 9 and continue with: 97 / 204

Advancing to step 4:
204 can be fit into 97 0 times, resulting in a remainder of 97.
Record the quotient 0 as the next digit in the result. 
Result so far: 10.0
If we take 0 away from 97, we end up with 97.
Take the next digit (9) from the dividend and append it to 97, then repeat: 979 / 204

Advancing to step 5:
The number 204 fits into 979 4 times, leaving a remainder of 163.
The number 4 becomes the next digit in our result. 
Result so far: 104.0
Subtracting 816 from 979 leaves us with 163.
Bring next digit (7) of the dividend behind the 163 and repeat the process: 1637 / 204

Advancing to step 6:
When dividing 1637 by 204, we get 8 with a remainder of 5.
The number 8 becomes the next digit in our result. 
Result so far: 1048.0
Deduct 1632 from 1637 and we're left with 5.
Bring next digit (1) of the dividend behind the 5 and repeat the process: 51 / 204

Step 7:
If we divide 51 by 204, we get 0 and a remainder of 51.
Put 0 as the next digit of the answer. 
Result so far: 10480.0
Subtracting 0 from 51 leaves us with 51.
Take the next digit (6) from the dividend and append it to 51, then repeat: 516 / 204

Advancing to step 8:
If we divide 516 by 204, we get 2 and a remainder of 108.
The number 2 becomes the next digit in our result. 
Result so far: 104802.0
If we take 408 away from 516, we end up with 108.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1080, and continue the process.

On to step 9:
If we divide 1080 by 204, we get 5 and a remainder of 60.
Use 5 as the next digit of our solution. 
Result so far: 104802.5
Subtracting 1020 from 1080 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Going ahead to step 10:
When dividing 600 by 204, we get 2 with a remainder of 192.
Put 2 as the next digit of the answer. 
Result so far: 104802.52
Deduct 408 from 600 and we're left with 192.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1920, and continue the process.

Step 11:
The number 204 fits into 1920 9 times, leaving a remainder of 84.
The number 9 becomes the next digit in our result. 
Result so far: 104802.529
The remainder is 84 after subtracting 1836 from 1920.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

Step 12:
204 goes into 840 4 times with a remainder of 24.
Write down 4 as next digit of the result. 
Result so far: 104802.5294
The remainder is 24 after subtracting 816 from 840.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Advancing to step 13:
240 divided by 204 is 1 with a remainder of 36.
Write down 1 as next digit of the result. 
Result so far: 104802.52941
Deduct 204 from 240 and we're left with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Advancing to step 14:
The number 204 fits into 360 1 times, leaving a remainder of 156.
Record the quotient 1 as the next digit in the result. 
Result so far: 104802.529411
The remainder is 156 after subtracting 204 from 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1560, and continue the process.

The final outcome is 104802.529411, with a leftover of 1.56e-05.