Let's divide 54121581 by 339
We're looking to find how many times 339 goes into 54121581.

On to step 1:
The number 339 fits into 5 0 times, leaving a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Take the next digit (4) from the dividend and append it to 5, then repeat: 54 / 339

Step 2:
54 divided by 339 is 0 with a remainder of 54.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 54, we get 54.
Append the next digit (1) from the dividend to 54 and continue with: 541 / 339

On to step 3:
541 divided by 339 is 1 with a remainder of 202.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 339 from 541 to get 202.
Fetch the next digit (2) from the dividend, attach it to 202 and continue: 2022 / 339

Going ahead to step 4:
2022 divided by 339 is 5 with a remainder of 327.
Put 5 as the next digit of the answer. 
Result so far: 15.0
Subtract 1695 from 2022 to get 327.
Bring next digit (1) of the dividend behind the 327 and repeat the process: 3271 / 339

Step 5:
When dividing 3271 by 339, we get 9 with a remainder of 220.
The number 9 becomes the next digit in our result. 
Result so far: 159.0
Deduct 3051 from 3271 and we're left with 220.
Grab the next digit (5) from the dividend, add it to 220, then carry on: 2205 / 339

Let's proceed to step 6:
2205 divided by 339 is 6 with a remainder of 171.
The number 6 becomes the next digit in our result. 
Result so far: 1596.0
Subtracting 2034 from 2205 leaves us with 171.
Take the next digit (8) from the dividend and append it to 171, then repeat: 1718 / 339

Advancing to step 7:
When dividing 1718 by 339, we get 5 with a remainder of 23.
The next digit of our result is 5. 
Result so far: 15965.0
Subtracting 1695 from 1718 leaves us with 23.
Fetch the next digit (1) from the dividend, attach it to 23 and continue: 231 / 339

Advancing to step 8:
The number 339 fits into 231 0 times, leaving a remainder of 231.
Write down 0 as next digit of the result. 
Result so far: 159650.0
Subtracting 0 from 231 leaves us with 231.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2310, and continue the process.

Step 9:
2310 divided by 339 is 6 with a remainder of 276.
Put 6 as the next digit of the answer. 
Result so far: 159650.6
If we subtract 2034 from 2310, we get 276.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2760, and continue the process.

On to step 10:
If we divide 2760 by 339, we get 8 and a remainder of 48.
The number 8 becomes the next digit in our result. 
Result so far: 159650.68
If we take 2712 away from 2760, we end up with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Moving on to step 11:
339 goes into 480 1 times with a remainder of 141.
Record the quotient 1 as the next digit in the result. 
Result so far: 159650.681
Subtract 339 from 480 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 12:
When dividing 1410 by 339, we get 4 with a remainder of 54.
Use 4 as the next digit of our solution. 
Result so far: 159650.6814
If we take 1356 away from 1410, we end up with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Moving on to step 13:
339 goes into 540 1 times with a remainder of 201.
Put 1 as the next digit of the answer. 
Result so far: 159650.68141
The remainder is 201 after subtracting 339 from 540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2010, and continue the process.

Advancing to step 14:
2010 divided by 339 is 5 with a remainder of 315.
Record the quotient 5 as the next digit in the result. 
Result so far: 159650.681415
Subtracting 1695 from 2010 leaves us with 315.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3150, and continue the process.

On to step 15:
The number 339 fits into 3150 9 times, leaving a remainder of 99.
The next digit of our result is 9. 
Result so far: 159650.6814159
Subtracting 3051 from 3150 leaves us with 99.
Since there are no more digits in the dividend, we add a zero to the remainder making it 990, and continue the process.

Step 16:
990 divided by 339 is 2 with a remainder of 312.
Record the quotient 2 as the next digit in the result. 
Result so far: 159650.68141592
If we take 678 away from 990, we end up with 312.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3120, and continue the process.

The final outcome is 159650.68141592, with a leftover of 3.12e-07.