643809 divided by 27 
We're looking to find how many times 27 goes into 643809.

On to step 1:
The number 27 fits into 6 0 times, leaving a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 27

Advancing to step 2:
If we divide 64 by 27, we get 2 and a remainder of 10.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Subtract 54 from 64 to get 10.
Fetch the next digit (3) from the dividend, attach it to 10 and continue: 103 / 27

Advancing to step 3:
103 divided by 27 is 3 with a remainder of 22.
The number 3 becomes the next digit in our result. 
Result so far: 23.0
If we subtract 81 from 103, we get 22.
Include the next digit (8) from the dividend after 22, then repeat: 228 / 27

Going ahead to step 4:
If we divide 228 by 27, we get 8 and a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 238.0
The remainder is 12 after subtracting 216 from 228.
Bring next digit (0) of the dividend behind the 12 and repeat the process: 120 / 27

Advancing to step 5:
If we divide 120 by 27, we get 4 and a remainder of 12.
Record the quotient 4 as the next digit in the result. 
Result so far: 2384.0
Subtracting 108 from 120 leaves us with 12.
Include the next digit (9) from the dividend after 12, then repeat: 129 / 27

Moving on to step 6:
When dividing 129 by 27, we get 4 with a remainder of 21.
Record the quotient 4 as the next digit in the result. 
Result so far: 23844.0
If we take 108 away from 129, we end up with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

On to step 7:
The number 27 fits into 210 7 times, leaving a remainder of 21.
Write down 7 as next digit of the result. 
Result so far: 23844.7
If we take 189 away from 210, we end up with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Moving on to step 8:
210 divided by 27 is 7 with a remainder of 21.
Record the quotient 7 as the next digit in the result. 
Result so far: 23844.77
Deduct 189 from 210 and we're left with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

In conclusion, the division gives 23844.77 with a balance of 0.021.