We're dividing 43397709 by 531 
Let's see how many times 531 fits into 43397709.

Step 1:
531 can be fit into 4 0 times, resulting in a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Bring next digit (3) of the dividend behind the 4 and repeat the process: 43 / 531

Step 2:
531 goes into 43 0 times with a remainder of 43.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 43 to get 43.
Append the next digit (3) from the dividend to 43 and continue with: 433 / 531

Let's proceed to step 3:
The number 531 fits into 433 0 times, leaving a remainder of 433.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 433, we end up with 433.
Bring next digit (9) of the dividend behind the 433 and repeat the process: 4339 / 531

Let's proceed to step 4:
If we divide 4339 by 531, we get 8 and a remainder of 91.
The next digit of our result is 8. 
Result so far: 8.0
The remainder is 91 after subtracting 4248 from 4339.
Take the next digit (7) from the dividend and append it to 91, then repeat: 917 / 531

On to step 5:
When dividing 917 by 531, we get 1 with a remainder of 386.
The number 1 becomes the next digit in our result. 
Result so far: 81.0
Deduct 531 from 917 and we're left with 386.
Fetch the next digit (7) from the dividend, attach it to 386 and continue: 3867 / 531

Moving on to step 6:
3867 divided by 531 is 7 with a remainder of 150.
Use 7 as the next digit of our solution. 
Result so far: 817.0
If we subtract 3717 from 3867, we get 150.
Take the next digit (0) from the dividend and append it to 150, then repeat: 1500 / 531

Step 7:
1500 divided by 531 is 2 with a remainder of 438.
The number 2 becomes the next digit in our result. 
Result so far: 8172.0
Subtract 1062 from 1500 to get 438.
Bring next digit (9) of the dividend behind the 438 and repeat the process: 4389 / 531

Moving on to step 8:
4389 divided by 531 is 8 with a remainder of 141.
Put 8 as the next digit of the answer. 
Result so far: 81728.0
Subtract 4248 from 4389 to get 141.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1410, and continue the process.

Step 9:
531 can be fit into 1410 2 times, resulting in a remainder of 348.
The number 2 becomes the next digit in our result. 
Result so far: 81728.2
The remainder is 348 after subtracting 1062 from 1410.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3480, and continue the process.

On to step 10:
When dividing 3480 by 531, we get 6 with a remainder of 294.
The number 6 becomes the next digit in our result. 
Result so far: 81728.26
Subtracting 3186 from 3480 leaves us with 294.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2940, and continue the process.

Going ahead to step 11:
The number 531 fits into 2940 5 times, leaving a remainder of 285.
The next digit of our result is 5. 
Result so far: 81728.265
Deduct 2655 from 2940 and we're left with 285.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2850, and continue the process.

On to step 12:
531 can be fit into 2850 5 times, resulting in a remainder of 195.
Use 5 as the next digit of our solution. 
Result so far: 81728.2655
The remainder is 195 after subtracting 2655 from 2850.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1950, and continue the process.

The final outcome is 81728.2655, with a leftover of 0.00195.