We look at the division of 621436 by 86 
Our goal is to divide 621436 by 86.

Step 1:
If we divide 6 by 86, we get 0 and a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Take the next digit (2) from the dividend and append it to 6, then repeat: 62 / 86

On to step 2:
86 goes into 62 0 times with a remainder of 62.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 62, we get 62.
Include the next digit (1) from the dividend after 62, then repeat: 621 / 86

Let's proceed to step 3:
When dividing 621 by 86, we get 7 with a remainder of 19.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
Subtracting 602 from 621 leaves us with 19.
Fetch the next digit (4) from the dividend, attach it to 19 and continue: 194 / 86

Moving on to step 4:
If we divide 194 by 86, we get 2 and a remainder of 22.
Use 2 as the next digit of our solution. 
Result so far: 72.0
If we take 172 away from 194, we end up with 22.
Include the next digit (3) from the dividend after 22, then repeat: 223 / 86

Moving on to step 5:
If we divide 223 by 86, we get 2 and a remainder of 51.
The next digit of our result is 2. 
Result so far: 722.0
Subtracting 172 from 223 leaves us with 51.
Grab the next digit (6) from the dividend, add it to 51, then carry on: 516 / 86

Let's proceed to step 6:
The number 86 fits into 516 6 times, leaving a remainder of 0.
The number 6 becomes the next digit in our result. 
Result so far: 7226.0
If we subtract 516 from 516, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 7:
0 divided by 86 is 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 7226.0
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 8:
The number 86 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 7226.0
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The quotient of the division is 7226.0, and the remainder is 0.0.