Let's divide 43398978 by 521
Let's see how many times 521 fits into 43398978.

On to step 1:
The number 521 fits into 4 0 times, leaving a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Grab the next digit (3) from the dividend, add it to 4, then carry on: 43 / 521

Advancing to step 2:
When dividing 43 by 521, we get 0 with a remainder of 43.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 43 leaves us with 43.
Fetch the next digit (3) from the dividend, attach it to 43 and continue: 433 / 521

Moving on to step 3:
The number 521 fits into 433 0 times, leaving a remainder of 433.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 433 and we're left with 433.
Fetch the next digit (9) from the dividend, attach it to 433 and continue: 4339 / 521

On to step 4:
521 can be fit into 4339 8 times, resulting in a remainder of 171.
Write down 8 as next digit of the result. 
Result so far: 8.0
If we take 4168 away from 4339, we end up with 171.
Bring next digit (8) of the dividend behind the 171 and repeat the process: 1718 / 521

Going ahead to step 5:
521 can be fit into 1718 3 times, resulting in a remainder of 155.
The number 3 becomes the next digit in our result. 
Result so far: 83.0
If we take 1563 away from 1718, we end up with 155.
Append the next digit (9) from the dividend to 155 and continue with: 1559 / 521

Let's proceed to step 6:
521 goes into 1559 2 times with a remainder of 517.
Write down 2 as next digit of the result. 
Result so far: 832.0
If we subtract 1042 from 1559, we get 517.
Bring next digit (7) of the dividend behind the 517 and repeat the process: 5177 / 521

Moving on to step 7:
If we divide 5177 by 521, we get 9 and a remainder of 488.
Record the quotient 9 as the next digit in the result. 
Result so far: 8329.0
If we subtract 4689 from 5177, we get 488.
Include the next digit (8) from the dividend after 488, then repeat: 4888 / 521

On to step 8:
521 can be fit into 4888 9 times, resulting in a remainder of 199.
The next digit of our result is 9. 
Result so far: 83299.0
Deduct 4689 from 4888 and we're left with 199.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1990, and continue the process.

Let's proceed to step 9:
The number 521 fits into 1990 3 times, leaving a remainder of 427.
The number 3 becomes the next digit in our result. 
Result so far: 83299.3
Subtracting 1563 from 1990 leaves us with 427.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4270, and continue the process.

Step 10:
4270 divided by 521 is 8 with a remainder of 102.
Write down 8 as next digit of the result. 
Result so far: 83299.38
The remainder is 102 after subtracting 4168 from 4270.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1020, and continue the process.

Step 11:
If we divide 1020 by 521, we get 1 and a remainder of 499.
Write down 1 as next digit of the result. 
Result so far: 83299.381
Deduct 521 from 1020 and we're left with 499.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4990, and continue the process.

Let's proceed to step 12:
4990 divided by 521 is 9 with a remainder of 301.
The number 9 becomes the next digit in our result. 
Result so far: 83299.3819
If we take 4689 away from 4990, we end up with 301.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3010, and continue the process.

Let's proceed to step 13:
521 goes into 3010 5 times with a remainder of 405.
The number 5 becomes the next digit in our result. 
Result so far: 83299.38195
If we subtract 2605 from 3010, we get 405.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4050, and continue the process.

Moving on to step 14:
521 goes into 4050 7 times with a remainder of 403.
The next digit of our result is 7. 
Result so far: 83299.381957
Deduct 3647 from 4050 and we're left with 403.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4030, and continue the process.

Advancing to step 15:
When dividing 4030 by 521, we get 7 with a remainder of 383.
Write down 7 as next digit of the result. 
Result so far: 83299.3819577
Subtract 3647 from 4030 to get 383.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3830, and continue the process.

After the division, we end up with 83299.3819577 and a remainder of 3.83e-06.