21390716 ÷ 206 
We want to divide 21390716 by 206.

On to step 1:
When dividing 2 by 206, we get 0 with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 206

Advancing to step 2:
206 can be fit into 21 0 times, resulting in a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 21, we get 21.
Fetch the next digit (3) from the dividend, attach it to 21 and continue: 213 / 206

Going ahead to step 3:
206 goes into 213 1 times with a remainder of 7.
The next digit of our result is 1. 
Result so far: 1.0
The remainder is 7 after subtracting 206 from 213.
Append the next digit (9) from the dividend to 7 and continue with: 79 / 206

Step 4:
When dividing 79 by 206, we get 0 with a remainder of 79.
Record the quotient 0 as the next digit in the result. 
Result so far: 10.0
Deduct 0 from 79 and we're left with 79.
Take the next digit (0) from the dividend and append it to 79, then repeat: 790 / 206

Moving on to step 5:
The number 206 fits into 790 3 times, leaving a remainder of 172.
The number 3 becomes the next digit in our result. 
Result so far: 103.0
Subtract 618 from 790 to get 172.
Fetch the next digit (7) from the dividend, attach it to 172 and continue: 1727 / 206

Going ahead to step 6:
When dividing 1727 by 206, we get 8 with a remainder of 79.
The next digit of our result is 8. 
Result so far: 1038.0
If we take 1648 away from 1727, we end up with 79.
Grab the next digit (1) from the dividend, add it to 79, then carry on: 791 / 206

On to step 7:
The number 206 fits into 791 3 times, leaving a remainder of 173.
Write down 3 as next digit of the result. 
Result so far: 10383.0
If we subtract 618 from 791, we get 173.
Bring next digit (6) of the dividend behind the 173 and repeat the process: 1736 / 206

On to step 8:
206 goes into 1736 8 times with a remainder of 88.
The next digit of our result is 8. 
Result so far: 103838.0
Deduct 1648 from 1736 and we're left with 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Going ahead to step 9:
206 goes into 880 4 times with a remainder of 56.
Use 4 as the next digit of our solution. 
Result so far: 103838.4
If we subtract 824 from 880, we get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Going ahead to step 10:
560 divided by 206 is 2 with a remainder of 148.
Write down 2 as next digit of the result. 
Result so far: 103838.42
If we take 412 away from 560, we end up with 148.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1480, and continue the process.

Advancing to step 11:
If we divide 1480 by 206, we get 7 and a remainder of 38.
Use 7 as the next digit of our solution. 
Result so far: 103838.427
If we take 1442 away from 1480, we end up with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Moving on to step 12:
206 can be fit into 380 1 times, resulting in a remainder of 174.
Record the quotient 1 as the next digit in the result. 
Result so far: 103838.4271
Deduct 206 from 380 and we're left with 174.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1740, and continue the process.

Step 13:
When dividing 1740 by 206, we get 8 with a remainder of 92.
The next digit of our result is 8. 
Result so far: 103838.42718
Subtract 1648 from 1740 to get 92.
Since there are no more digits in the dividend, we add a zero to the remainder making it 920, and continue the process.

On to step 14:
When dividing 920 by 206, we get 4 with a remainder of 96.
Write down 4 as next digit of the result. 
Result so far: 103838.427184
If we take 824 away from 920, we end up with 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

Moving on to step 15:
960 divided by 206 is 4 with a remainder of 136.
Put 4 as the next digit of the answer. 
Result so far: 103838.4271844
Subtract 824 from 960 to get 136.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1360, and continue the process.

The final outcome is 103838.4271844, with a leftover of 1.36e-06.