43218240 ÷ 86 
We want to divide 43218240 by 86.

Going ahead to step 1:
The number 86 fits into 4 0 times, leaving a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Take the next digit (3) from the dividend and append it to 4, then repeat: 43 / 86

Advancing to step 2:
The number 86 fits into 43 0 times, leaving a remainder of 43.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 43, we get 43.
Include the next digit (2) from the dividend after 43, then repeat: 432 / 86

Going ahead to step 3:
86 goes into 432 5 times with a remainder of 2.
Put 5 as the next digit of the answer. 
Result so far: 5.0
Subtract 430 from 432 to get 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 86

Let's proceed to step 4:
If we divide 21 by 86, we get 0 and a remainder of 21.
Put 0 as the next digit of the answer. 
Result so far: 50.0
Subtracting 0 from 21 leaves us with 21.
Include the next digit (8) from the dividend after 21, then repeat: 218 / 86

Moving on to step 5:
86 can be fit into 218 2 times, resulting in a remainder of 46.
Put 2 as the next digit of the answer. 
Result so far: 502.0
The remainder is 46 after subtracting 172 from 218.
Take the next digit (2) from the dividend and append it to 46, then repeat: 462 / 86

Moving on to step 6:
When dividing 462 by 86, we get 5 with a remainder of 32.
Record the quotient 5 as the next digit in the result. 
Result so far: 5025.0
The remainder is 32 after subtracting 430 from 462.
Take the next digit (4) from the dividend and append it to 32, then repeat: 324 / 86

On to step 7:
86 can be fit into 324 3 times, resulting in a remainder of 66.
Record the quotient 3 as the next digit in the result. 
Result so far: 50253.0
The remainder is 66 after subtracting 258 from 324.
Take the next digit (0) from the dividend and append it to 66, then repeat: 660 / 86

Let's proceed to step 8:
The number 86 fits into 660 7 times, leaving a remainder of 58.
The next digit of our result is 7. 
Result so far: 502537.0
Subtract 602 from 660 to 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.

Moving on to step 9:
If we divide 580 by 86, we get 6 and a remainder of 64.
Record the quotient 6 as the next digit in the result. 
Result so far: 502537.6
Subtracting 516 from 580 leaves us 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.

Going ahead to step 10:
When dividing 640 by 86, we get 7 with a remainder of 38.
Put 7 as the next digit of the answer. 
Result so far: 502537.67
Deduct 602 from 640 and we're left 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.

Advancing to step 11:
380 divided by 86 is 4 with a remainder of 36.
The number 4 becomes the next digit in our result. 
Result so far: 502537.674
If we take 344 away from 380, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Step 12:
When dividing 360 by 86, we get 4 with a remainder of 16.
Use 4 as the next digit of our solution. 
Result so far: 502537.6744
The remainder is 16 after subtracting 344 from 360.
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 502537.6744 with a remainder of 0.00016.