53380513 ÷ 343 
Our goal is to divide 53380513 by 343.

On to step 1:
The number 343 fits into 5 0 times, leaving a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Include the next digit (3) from the dividend after 5, then repeat: 53 / 343

Going ahead to step 2:
If we divide 53 by 343, we get 0 and a remainder of 53.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 53 leaves us with 53.
Fetch the next digit (3) from the dividend, attach it to 53 and continue: 533 / 343

Advancing to step 3:
The number 343 fits into 533 1 times, leaving a remainder of 190.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we take 343 away from 533, we end up with 190.
Grab the next digit (8) from the dividend, add it to 190, then carry on: 1908 / 343

Step 4:
1908 divided by 343 is 5 with a remainder of 193.
Put 5 as the next digit of the answer. 
Result so far: 15.0
If we take 1715 away from 1908, we end up with 193.
Take the next digit (0) from the dividend and append it to 193, then repeat: 1930 / 343

Let's proceed to step 5:
When dividing 1930 by 343, we get 5 with a remainder of 215.
The next digit of our result is 5. 
Result so far: 155.0
Deduct 1715 from 1930 and we're left with 215.
Bring next digit (5) of the dividend behind the 215 and repeat the process: 2155 / 343

On to step 6:
The number 343 fits into 2155 6 times, leaving a remainder of 97.
Record the quotient 6 as the next digit in the result. 
Result so far: 1556.0
Subtract 2058 from 2155 to get 97.
Fetch the next digit (1) from the dividend, attach it to 97 and continue: 971 / 343

Step 7:
If we divide 971 by 343, we get 2 and a remainder of 285.
Write down 2 as next digit of the result. 
Result so far: 15562.0
If we take 686 away from 971, we end up with 285.
Take the next digit (3) from the dividend and append it to 285, then repeat: 2853 / 343

On to step 8:
If we divide 2853 by 343, we get 8 and a remainder of 109.
Record the quotient 8 as the next digit in the result. 
Result so far: 155628.0
If we take 2744 away from 2853, we end up with 109.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1090, and continue the process.

Going ahead to step 9:
If we divide 1090 by 343, we get 3 and a remainder of 61.
The number 3 becomes the next digit in our result. 
Result so far: 155628.3
Subtract 1029 from 1090 to get 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Step 10:
If we divide 610 by 343, we get 1 and a remainder of 267.
The number 1 becomes the next digit in our result. 
Result so far: 155628.31
Subtract 343 from 610 to get 267.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2670, and continue the process.

On to step 11:
343 can be fit into 2670 7 times, resulting in a remainder of 269.
Use 7 as the next digit of our solution. 
Result so far: 155628.317
Subtracting 2401 from 2670 leaves us with 269.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2690, and continue the process.

Moving on to step 12:
If we divide 2690 by 343, we get 7 and a remainder of 289.
Put 7 as the next digit of the answer. 
Result so far: 155628.3177
If we subtract 2401 from 2690, we get 289.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2890, and continue the process.

The final outcome is 155628.3177, with a leftover of 0.00289.