5643990 divided by 866 
Let's see how many times 866 fits into 5643990.

Advancing to step 1:
866 can be fit into 5 0 times, resulting in a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Take the next digit (6) from the dividend and append it to 5, then repeat: 56 / 866

Step 2:
The number 866 fits into 56 0 times, leaving a remainder of 56.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 56, we end up with 56.
Grab the next digit (4) from the dividend, add it to 56, then carry on: 564 / 866

Advancing to step 3:
866 goes into 564 0 times with a remainder of 564.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 564 after subtracting 0 from 564.
Bring next digit (3) of the dividend behind the 564 and repeat the process: 5643 / 866

On to step 4:
5643 divided by 866 is 6 with a remainder of 447.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
Subtracting 5196 from 5643 leaves us with 447.
Grab the next digit (9) from the dividend, add it to 447, then carry on: 4479 / 866

On to step 5:
The number 866 fits into 4479 5 times, leaving a remainder of 149.
Record the quotient 5 as the next digit in the result. 
Result so far: 65.0
Subtract 4330 from 4479 to get 149.
Take the next digit (9) from the dividend and append it to 149, then repeat: 1499 / 866

On to step 6:
If we divide 1499 by 866, we get 1 and a remainder of 633.
The next digit of our result is 1. 
Result so far: 651.0
The remainder is 633 after subtracting 866 from 1499.
Take the next digit (0) from the dividend and append it to 633, then repeat: 6330 / 866

On to step 7:
6330 divided by 866 is 7 with a remainder of 268.
Record the quotient 7 as the next digit in the result. 
Result so far: 6517.0
If we subtract 6062 from 6330, we get 268.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2680, and continue the process.

Going ahead to step 8:
2680 divided by 866 is 3 with a remainder of 82.
The number 3 becomes the next digit in our result. 
Result so far: 6517.3
Deduct 2598 from 2680 and we're left with 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Moving on to step 9:
866 goes into 820 0 times with a remainder of 820.
Write down 0 as next digit of the result. 
Result so far: 6517.3
Subtract 0 from 820 to get 820.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8200, and continue the process.

On to step 10:
The number 866 fits into 8200 9 times, leaving a remainder of 406.
The number 9 becomes the next digit in our result. 
Result so far: 6517.309
Subtracting 7794 from 8200 leaves us with 406.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4060, and continue the process.

Let's proceed to step 11:
The number 866 fits into 4060 4 times, leaving a remainder of 596.
Use 4 as the next digit of our solution. 
Result so far: 6517.3094
Deduct 3464 from 4060 and we're left with 596.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5960, and continue the process.

Going ahead to step 12:
5960 divided by 866 is 6 with a remainder of 764.
Write down 6 as next digit of the result. 
Result so far: 6517.30946
Deduct 5196 from 5960 and we're left with 764.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7640, and continue the process.

Advancing to step 13:
When dividing 7640 by 866, we get 8 with a remainder of 712.
The number 8 becomes the next digit in our result. 
Result so far: 6517.309468
Subtract 6928 from 7640 to get 712.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7120, and continue the process.

Going ahead to step 14:
866 goes into 7120 8 times with a remainder of 192.
Record the quotient 8 as the next digit in the result. 
Result so far: 6517.3094688
Subtracting 6928 from 7120 leaves us 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.

After the division, we end up with 6517.3094688 and a remainder of 1.92e-06.