644542 divided by 86 
We want to divide 644542 by 86.

Let's proceed to step 1:
86 goes into 6 0 times with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 86

On to step 2:
86 goes into 64 0 times with a remainder of 64.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 64, we end up with 64.
Append the next digit (4) from the dividend to 64 and continue with: 644 / 86

Moving on to step 3:
86 goes into 644 7 times with a remainder of 42.
The next digit of our result is 7. 
Result so far: 7.0
If we take 602 away from 644, we end up with 42.
Bring next digit (5) of the dividend behind the 42 and repeat the process: 425 / 86

Advancing to step 4:
86 goes into 425 4 times with a remainder of 81.
Record the quotient 4 as the next digit in the result. 
Result so far: 74.0
Subtracting 344 from 425 leaves us with 81.
Append the next digit (4) from the dividend to 81 and continue with: 814 / 86

Advancing to step 5:
If we divide 814 by 86, we get 9 and a remainder of 40.
The next digit of our result is 9. 
Result so far: 749.0
Subtracting 774 from 814 leaves us with 40.
Include the next digit (2) from the dividend after 40, then repeat: 402 / 86

On to step 6:
86 can be fit into 402 4 times, resulting in a remainder of 58.
Record the quotient 4 as the next digit in the result. 
Result so far: 7494.0
If we subtract 344 from 402, we get 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Let's proceed to step 7:
When dividing 580 by 86, we get 6 with a remainder of 64.
Write down 6 as next digit of the result. 
Result so far: 7494.6
Subtract 516 from 580 to get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Moving on to step 8:
86 can be fit into 640 7 times, resulting in a remainder of 38.
Write down 7 as next digit of the result. 
Result so far: 7494.67
If we subtract 602 from 640, we get 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Advancing to step 9:
The number 86 fits into 380 4 times, leaving a remainder of 36.
Write down 4 as next digit of the result. 
Result so far: 7494.674
The remainder is 36 after subtracting 344 from 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Advancing to step 10:
360 divided by 86 is 4 with a remainder of 16.
Record the quotient 4 as the next digit in the result. 
Result so far: 7494.6744
Subtracting 344 from 360 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

The final result is 7494.6744 with a remainder of 0.00016.