We're dividing 643229 by 86 
Let's see how many times 86 fits into 643229.

Moving on to step 1:
The number 86 fits into 6 0 times, leaving a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Fetch the next digit (4) from the dividend, attach it to 6 and continue: 64 / 86

On to step 2:
When dividing 64 by 86, we get 0 with a remainder of 64.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 64 leaves us with 64.
Fetch the next digit (3) from the dividend, attach it to 64 and continue: 643 / 86

Step 3:
The number 86 fits into 643 7 times, leaving a remainder of 41.
Use 7 as the next digit of our solution. 
Result so far: 7.0
Subtracting 602 from 643 leaves us with 41.
Take the next digit (2) from the dividend and append it to 41, then repeat: 412 / 86

On to step 4:
86 goes into 412 4 times with a remainder of 68.
Write down 4 as next digit of the result. 
Result so far: 74.0
Subtract 344 from 412 to get 68.
Grab the next digit (2) from the dividend, add it to 68, then carry on: 682 / 86

On to step 5:
If we divide 682 by 86, we get 7 and a remainder of 80.
The next digit of our result is 7. 
Result so far: 747.0
Subtracting 602 from 682 leaves us with 80.
Grab the next digit (9) from the dividend, add it to 80, then carry on: 809 / 86

Going ahead to step 6:
The number 86 fits into 809 9 times, leaving a remainder of 35.
Put 9 as the next digit of the answer. 
Result so far: 7479.0
If we take 774 away from 809, we end up with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

On to step 7:
When dividing 350 by 86, we get 4 with a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 7479.4
Subtracting 344 from 350 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 8:
If we divide 60 by 86, we get 0 and a remainder of 60.
Put 0 as the next digit of the answer. 
Result so far: 7479.4
If we subtract 0 from 60, we get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 9:
If we divide 600 by 86, we get 6 and a remainder of 84.
The next digit of our result is 6. 
Result so far: 7479.406
Subtract 516 from 600 to get 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

Moving on to step 10:
The number 86 fits into 840 9 times, leaving a remainder of 66.
Record the quotient 9 as the next digit in the result. 
Result so far: 7479.4069
The remainder is 66 after subtracting 774 from 840.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Going ahead to step 11:
86 goes into 660 7 times with a remainder of 58.
The next digit of our result is 7. 
Result so far: 7479.40697
Subtracting 602 from 660 leaves us with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Step 12:
86 can be fit into 580 6 times, resulting in a remainder of 64.
The number 6 becomes the next digit in our result. 
Result so far: 7479.406976
If we take 516 away from 580, we end up with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Advancing to step 13:
86 can be fit into 640 7 times, resulting in a remainder of 38.
The number 7 becomes the next digit in our result. 
Result so far: 7479.4069767
If we take 602 away from 640, 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.

Step 14:
86 goes into 380 4 times with a remainder of 36.
Put 4 as the next digit of the answer. 
Result so far: 7479.40697674
Subtract 344 from 380 to get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

The quotient of the division is 7479.40697674, and the remainder is 3.6e-08.