We divide 840420 by 53
We want to figure out the number of times 840420 can be divided by 53.

On to step 1:
53 goes into 8 0 times with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Fetch the next digit (4) from the dividend, attach it to 8 and continue: 84 / 53

Advancing to step 2:
53 goes into 84 1 times with a remainder of 31.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 53 from 84 and we're left with 31.
Take the next digit (0) from the dividend and append it to 31, then repeat: 310 / 53

On to step 3:
When dividing 310 by 53, we get 5 with a remainder of 45.
Put 5 as the next digit of the answer. 
Result so far: 15.0
Subtracting 265 from 310 leaves us with 45.
Take the next digit (4) from the dividend and append it to 45, then repeat: 454 / 53

Step 4:
When dividing 454 by 53, we get 8 with a remainder of 30.
Put 8 as the next digit of the answer. 
Result so far: 158.0
If we take 424 away from 454, we end up with 30.
Fetch the next digit (2) from the dividend, attach it to 30 and continue: 302 / 53

Step 5:
302 divided by 53 is 5 with a remainder of 37.
Write down 5 as next digit of the result. 
Result so far: 1585.0
Subtracting 265 from 302 leaves us with 37.
Include the next digit (0) from the dividend after 37, then repeat: 370 / 53

Moving on to step 6:
53 can be fit into 370 6 times, resulting in a remainder of 52.
Record the quotient 6 as the next digit in the result. 
Result so far: 15856.0
Subtracting 318 from 370 leaves us with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Advancing to step 7:
When dividing 520 by 53, we get 9 with a remainder of 43.
Use 9 as the next digit of our solution. 
Result so far: 15856.9
The remainder is 43 after subtracting 477 from 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Moving on to step 8:
53 goes into 430 8 times with a remainder of 6.
The number 8 becomes the next digit in our result. 
Result so far: 15856.98
The remainder is 6 after subtracting 424 from 430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 9:
If we divide 60 by 53, we get 1 and a remainder of 7.
Write down 1 as next digit of the result. 
Result so far: 15856.981
If we subtract 53 from 60, we get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Moving on to step 10:
53 can be fit into 70 1 times, resulting in a remainder of 17.
Use 1 as the next digit of our solution. 
Result so far: 15856.9811
Subtracting 53 from 70 leaves us with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Our division results in 15856.9811 with a remaining 0.00017.