We're dividing 16312021 by 866 
We want to figure out the number of times 16312021 can be divided by 866.

On to step 1:
If we divide 1 by 866, we get 0 and a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Include the next digit (6) from the dividend after 1, then repeat: 16 / 866

Let's proceed to step 2:
If we divide 16 by 866, we get 0 and a remainder of 16.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 16 after subtracting 0 from 16.
Fetch the next digit (3) from the dividend, attach it to 16 and continue: 163 / 866

Going ahead to step 3:
When dividing 163 by 866, we get 0 with a remainder of 163.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 163 leaves us with 163.
Append the next digit (1) from the dividend to 163 and continue with: 1631 / 866

Let's proceed to step 4:
If we divide 1631 by 866, we get 1 and a remainder of 765.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtract 866 from 1631 to get 765.
Take the next digit (2) from the dividend and append it to 765, then repeat: 7652 / 866

Moving on to step 5:
The number 866 fits into 7652 8 times, leaving a remainder of 724.
The next digit of our result is 8. 
Result so far: 18.0
The remainder is 724 after subtracting 6928 from 7652.
Bring next digit (0) of the dividend behind the 724 and repeat the process: 7240 / 866

Let's proceed to step 6:
7240 divided by 866 is 8 with a remainder of 312.
Write down 8 as next digit of the result. 
Result so far: 188.0
Subtract 6928 from 7240 to get 312.
Include the next digit (2) from the dividend after 312, then repeat: 3122 / 866

Let's proceed to step 7:
When dividing 3122 by 866, we get 3 with a remainder of 524.
Write down 3 as next digit of the result. 
Result so far: 1883.0
The remainder is 524 after subtracting 2598 from 3122.
Grab the next digit (1) from the dividend, add it to 524, then carry on: 5241 / 866

Step 8:
866 goes into 5241 6 times with a remainder of 45.
Record the quotient 6 as the next digit in the result. 
Result so far: 18836.0
If we subtract 5196 from 5241, we get 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

On to step 9:
The number 866 fits into 450 0 times, leaving a remainder of 450.
Use 0 as the next digit of our solution. 
Result so far: 18836.0
Deduct 0 from 450 and we're left with 450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4500, and continue the process.

Advancing to step 10:
The number 866 fits into 4500 5 times, leaving a remainder of 170.
Put 5 as the next digit of the answer. 
Result so far: 18836.05
The remainder is 170 after subtracting 4330 from 4500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

Going ahead to step 11:
If we divide 1700 by 866, we get 1 and a remainder of 834.
The number 1 becomes the next digit in our result. 
Result so far: 18836.051
The remainder is 834 after subtracting 866 from 1700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8340, and continue the process.

Advancing to step 12:
8340 divided by 866 is 9 with a remainder of 546.
Put 9 as the next digit of the answer. 
Result so far: 18836.0519
If we take 7794 away from 8340, we end up with 546.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5460, and continue the process.

Advancing to step 13:
When dividing 5460 by 866, we get 6 with a remainder of 264.
Write down 6 as next digit of the result. 
Result so far: 18836.05196
Subtracting 5196 from 5460 leaves us with 264.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2640, and continue the process.

Step 14:
When dividing 2640 by 866, we get 3 with a remainder of 42.
Record the quotient 3 as the next digit in the result. 
Result so far: 18836.051963
Subtract 2598 from 2640 to get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Moving on to step 15:
When dividing 420 by 866, we get 0 with a remainder of 420.
The number 0 becomes the next digit in our result. 
Result so far: 18836.051963
Subtract 0 from 420 to get 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4200, and continue the process.

Going ahead to step 16:
The number 866 fits into 4200 4 times, leaving a remainder of 736.
The number 4 becomes the next digit in our result. 
Result so far: 18836.05196304
Deduct 3464 from 4200 and we're left with 736.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7360, and continue the process.

After the division, we end up with 18836.05196304 and a remainder of 7.36e-07.