We're dividing 54243908 by 840 
We're looking to find how many times 840 goes into 54243908.

Going ahead to step 1:
840 can be fit into 5 0 times, resulting in a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Append the next digit (4) from the dividend to 5 and continue with: 54 / 840

Advancing to step 2:
840 can be fit into 54 0 times, resulting in a remainder of 54.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 54 and we're left with 54.
Append the next digit (2) from the dividend to 54 and continue with: 542 / 840

On to step 3:
The number 840 fits into 542 0 times, leaving a remainder of 542.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 542 to get 542.
Include the next digit (4) from the dividend after 542, then repeat: 5424 / 840

Moving on to step 4:
If we divide 5424 by 840, we get 6 and a remainder of 384.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
Subtract 5040 from 5424 to get 384.
Take the next digit (3) from the dividend and append it to 384, then repeat: 3843 / 840

Step 5:
The number 840 fits into 3843 4 times, leaving a remainder of 483.
The number 4 becomes the next digit in our result. 
Result so far: 64.0
Deduct 3360 from 3843 and we're left with 483.
Fetch the next digit (9) from the dividend, attach it to 483 and continue: 4839 / 840

Moving on to step 6:
If we divide 4839 by 840, we get 5 and a remainder of 639.
Put 5 as the next digit of the answer. 
Result so far: 645.0
Deduct 4200 from 4839 and we're left with 639.
Append the next digit (0) from the dividend to 639 and continue with: 6390 / 840

Let's proceed to step 7:
If we divide 6390 by 840, we get 7 and a remainder of 510.
The next digit of our result is 7. 
Result so far: 6457.0
Deduct 5880 from 6390 and we're left with 510.
Fetch the next digit (8) from the dividend, attach it to 510 and continue: 5108 / 840

On to step 8:
5108 divided by 840 is 6 with a remainder of 68.
Write down 6 as next digit of the result. 
Result so far: 64576.0
The remainder is 68 after subtracting 5040 from 5108.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Advancing to step 9:
If we divide 680 by 840, we get 0 and a remainder of 680.
The next digit of our result is 0. 
Result so far: 64576.0
If we subtract 0 from 680, we get 680.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6800, and continue the process.

Advancing to step 10:
6800 divided by 840 is 8 with a remainder of 80.
Record the quotient 8 as the next digit in the result. 
Result so far: 64576.08
If we take 6720 away from 6800, we end up with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Moving on to step 11:
When dividing 800 by 840, we get 0 with a remainder of 800.
Use 0 as the next digit of our solution. 
Result so far: 64576.08
The remainder is 800 after subtracting 0 from 800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8000, and continue the process.

Step 12:
840 goes into 8000 9 times with a remainder of 440.
The number 9 becomes the next digit in our result. 
Result so far: 64576.0809
If we subtract 7560 from 8000, we get 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4400, and continue the process.

Moving on to step 13:
If we divide 4400 by 840, we get 5 and a remainder of 200.
Put 5 as the next digit of the answer. 
Result so far: 64576.08095
Subtract 4200 from 4400 to get 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

On to step 14:
The number 840 fits into 2000 2 times, leaving a remainder of 320.
The number 2 becomes the next digit in our result. 
Result so far: 64576.080952
The remainder is 320 after subtracting 1680 from 2000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

On to step 15:
840 can be fit into 3200 3 times, resulting in a remainder of 680.
The number 3 becomes the next digit in our result. 
Result so far: 64576.0809523
Deduct 2520 from 3200 and we're left with 680.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6800, and continue the process.

Moving on to step 16:
840 goes into 6800 8 times with a remainder of 80.
Record the quotient 8 as the next digit in the result. 
Result so far: 64576.08095238
Subtract 6720 from 6800 to get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

After the division, we end up with 64576.08095238 and a remainder of 8e-08.