Let's divide 21020171 by 688
We want to divide 21020171 by 688.

Going ahead to step 1:
688 can be fit into 2 0 times, resulting in 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.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 688

Advancing to step 2:
The number 688 fits into 21 0 times, leaving a remainder of 21.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 21, we get 21.
Include the next digit (0) from the dividend after 21, then repeat: 210 / 688

Let's proceed to step 3:
688 goes into 210 0 times with a remainder of 210.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 210 and we're left with 210.
Include the next digit (2) from the dividend after 210, then repeat: 2102 / 688

Step 4:
688 goes into 2102 3 times with a remainder of 38.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Subtract 2064 from 2102 to get 38.
Grab the next digit (0) from the dividend, add it to 38, then carry on: 380 / 688

Moving on to step 5:
If we divide 380 by 688, we get 0 and a remainder of 380.
The number 0 becomes the next digit in our result. 
Result so far: 30.0
Subtracting 0 from 380 leaves us with 380.
Append the next digit (1) from the dividend to 380 and continue with: 3801 / 688

Going ahead to step 6:
688 goes into 3801 5 times with a remainder of 361.
Put 5 as the next digit of the answer. 
Result so far: 305.0
If we take 3440 away from 3801, we end up with 361.
Bring next digit (7) of the dividend behind the 361 and repeat the process: 3617 / 688

Going ahead to step 7:
The number 688 fits into 3617 5 times, leaving a remainder of 177.
The next digit of our result is 5. 
Result so far: 3055.0
If we subtract 3440 from 3617, we get 177.
Fetch the next digit (1) from the dividend, attach it to 177 and continue: 1771 / 688

Step 8:
1771 divided by 688 is 2 with a remainder of 395.
Write down 2 as next digit of the result. 
Result so far: 30552.0
Deduct 1376 from 1771 and we're left with 395.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3950, and continue the process.

Step 9:
688 can be fit into 3950 5 times, resulting in a remainder of 510.
Record the quotient 5 as the next digit in the result. 
Result so far: 30552.5
If we take 3440 away from 3950, we end up with 510.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5100, and continue the process.

Advancing to step 10:
5100 divided by 688 is 7 with a remainder of 284.
Record the quotient 7 as the next digit in the result. 
Result so far: 30552.57
Deduct 4816 from 5100 and we're left with 284.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2840, and continue the process.

Step 11:
When dividing 2840 by 688, we get 4 with a remainder of 88.
Record the quotient 4 as the next digit in the result. 
Result so far: 30552.574
Subtract 2752 from 2840 to get 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Moving on to step 12:
688 can be fit into 880 1 times, resulting in a remainder of 192.
Write down 1 as next digit of the result. 
Result so far: 30552.5741
Subtract 688 from 880 to get 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 13:
The number 688 fits into 1920 2 times, leaving a remainder of 544.
Put 2 as the next digit of the answer. 
Result so far: 30552.57412
Subtract 1376 from 1920 to get 544.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5440, and continue the process.

Moving on to step 14:
688 goes into 5440 7 times with a remainder of 624.
Use 7 as the next digit of our solution. 
Result so far: 30552.574127
Subtracting 4816 from 5440 leaves us with 624.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6240, and continue the process.

Step 15:
When dividing 6240 by 688, we get 9 with a remainder of 48.
Record the quotient 9 as the next digit in the result. 
Result so far: 30552.5741279
Deduct 6192 from 6240 and we're left with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Let's proceed to step 16:
480 divided by 688 is 0 with a remainder of 480.
Write down 0 as next digit of the result. 
Result so far: 30552.5741279
If we take 0 away from 480, we end up with 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

The final outcome is 30552.5741279, with a leftover of 4.8e-07.