We look at the division of 45408134 by 840 
Let's see how many times 840 fits into 45408134.

On to step 1:
The number 840 fits into 4 0 times, leaving a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Bring next digit (5) of the dividend behind the 4 and repeat the process: 45 / 840

Going ahead to step 2:
840 can be fit into 45 0 times, resulting in a remainder of 45.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 45, we end up with 45.
Take the next digit (4) from the dividend and append it to 45, then repeat: 454 / 840

On to step 3:
If we divide 454 by 840, we get 0 and a remainder of 454.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 454 leaves us with 454.
Fetch the next digit (0) from the dividend, attach it to 454 and continue: 4540 / 840

Going ahead to step 4:
When dividing 4540 by 840, we get 5 with a remainder of 340.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
Deduct 4200 from 4540 and we're left with 340.
Fetch the next digit (8) from the dividend, attach it to 340 and continue: 3408 / 840

On to step 5:
If we divide 3408 by 840, we get 4 and a remainder of 48.
Record the quotient 4 as the next digit in the result. 
Result so far: 54.0
If we take 3360 away from 3408, we end up with 48.
Bring next digit (1) of the dividend behind the 48 and repeat the process: 481 / 840

Going ahead to step 6:
840 goes into 481 0 times with a remainder of 481.
The next digit of our result is 0. 
Result so far: 540.0
The remainder is 481 after subtracting 0 from 481.
Include the next digit (3) from the dividend after 481, then repeat: 4813 / 840

On to step 7:
When dividing 4813 by 840, we get 5 with a remainder of 613.
Use 5 as the next digit of our solution. 
Result so far: 5405.0
If we take 4200 away from 4813, we end up with 613.
Append the next digit (4) from the dividend to 613 and continue with: 6134 / 840

Going ahead to step 8:
If we divide 6134 by 840, we get 7 and a remainder of 254.
Record the quotient 7 as the next digit in the result. 
Result so far: 54057.0
Subtracting 5880 from 6134 leaves us with 254.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2540, and continue the process.

Going ahead to step 9:
The number 840 fits into 2540 3 times, leaving a remainder of 20.
Record the quotient 3 as the next digit in the result. 
Result so far: 54057.3
Subtracting 2520 from 2540 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 10:
When dividing 200 by 840, we get 0 with a remainder of 200.
The next digit of our result is 0. 
Result so far: 54057.3
The remainder is 200 after subtracting 0 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Advancing to step 11:
When dividing 2000 by 840, we get 2 with a remainder of 320.
Record the quotient 2 as the next digit in the result. 
Result so far: 54057.302
If we subtract 1680 from 2000, we get 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Advancing to step 12:
The number 840 fits into 3200 3 times, leaving a remainder of 680.
The number 3 becomes the next digit in our result. 
Result so far: 54057.3023
The remainder is 680 after subtracting 2520 from 3200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6800, and continue the process.

Going ahead to step 13:
840 can be fit into 6800 8 times, resulting in a remainder of 80.
The next digit of our result is 8. 
Result so far: 54057.30238
If we subtract 6720 from 6800, we 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.

Step 14:
840 goes into 800 0 times with a remainder of 800.
Record the quotient 0 as the next digit in the result. 
Result so far: 54057.30238
If we subtract 0 from 800, we get 800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8000, and continue the process.

Going ahead to step 15:
When dividing 8000 by 840, we get 9 with a remainder of 440.
Put 9 as the next digit of the answer. 
Result so far: 54057.3023809
Subtract 7560 from 8000 to 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 16:
If we divide 4400 by 840, we get 5 and a remainder of 200.
The number 5 becomes the next digit in our result. 
Result so far: 54057.30238095
The remainder is 200 after subtracting 4200 from 4400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

The final result is 54057.30238095 with a remainder of 2e-07.