53390009 ÷ 305 
We want to figure out the number of times 53390009 can be divided by 305.

On to step 1:
When dividing 5 by 305, we get 0 with a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Bring next digit (3) of the dividend behind the 5 and repeat the process: 53 / 305

On to step 2:
305 can be fit into 53 0 times, resulting in a remainder of 53.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 53, we get 53.
Include the next digit (3) from the dividend after 53, then repeat: 533 / 305

Step 3:
If we divide 533 by 305, we get 1 and a remainder of 228.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we take 305 away from 533, we end up with 228.
Fetch the next digit (9) from the dividend, attach it to 228 and continue: 2289 / 305

Let's proceed to step 4:
305 can be fit into 2289 7 times, resulting in a remainder of 154.
Write down 7 as next digit of the result. 
Result so far: 17.0
Subtracting 2135 from 2289 leaves us with 154.
Bring next digit (0) of the dividend behind the 154 and repeat the process: 1540 / 305

On to step 5:
305 can be fit into 1540 5 times, resulting in a remainder of 15.
The next digit of our result is 5. 
Result so far: 175.0
The remainder is 15 after subtracting 1525 from 1540.
Grab the next digit (0) from the dividend, add it to 15, then carry on: 150 / 305

On to step 6:
305 can be fit into 150 0 times, resulting in a remainder of 150.
Record the quotient 0 as the next digit in the result. 
Result so far: 1750.0
Subtract 0 from 150 to get 150.
Grab the next digit (0) from the dividend, add it to 150, then carry on: 1500 / 305

Advancing to step 7:
The number 305 fits into 1500 4 times, leaving a remainder of 280.
Put 4 as the next digit of the answer. 
Result so far: 17504.0
The remainder is 280 after subtracting 1220 from 1500.
Take the next digit (9) from the dividend and append it to 280, then repeat: 2809 / 305

Step 8:
305 goes into 2809 9 times with a remainder of 64.
Put 9 as the next digit of the answer. 
Result so far: 175049.0
Subtracting 2745 from 2809 leaves us with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Let's proceed to step 9:
640 divided by 305 is 2 with a remainder of 30.
Write down 2 as next digit of the result. 
Result so far: 175049.2
Deduct 610 from 640 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 10:
The number 305 fits into 300 0 times, leaving a remainder of 300.
Record the quotient 0 as the next digit in the result. 
Result so far: 175049.2
The remainder is 300 after subtracting 0 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Going ahead to step 11:
305 can be fit into 3000 9 times, resulting in a remainder of 255.
Put 9 as the next digit of the answer. 
Result so far: 175049.209
Deduct 2745 from 3000 and we're left with 255.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2550, and continue the process.

Moving on to step 12:
305 can be fit into 2550 8 times, resulting in a remainder of 110.
Use 8 as the next digit of our solution. 
Result so far: 175049.2098
Subtracting 2440 from 2550 leaves us with 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

On to step 13:
305 can be fit into 1100 3 times, resulting in a remainder of 185.
The number 3 becomes the next digit in our result. 
Result so far: 175049.20983
The remainder is 185 after subtracting 915 from 1100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1850, and continue the process.

Going ahead to step 14:
1850 divided by 305 is 6 with a remainder of 20.
The next digit of our result is 6. 
Result so far: 175049.209836
Deduct 1830 from 1850 and we're left 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.

Moving on to step 15:
The number 305 fits into 200 0 times, leaving a remainder of 200.
The next digit of our result is 0. 
Result so far: 175049.209836
If we take 0 away from 200, we end up with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Step 16:
2000 divided by 305 is 6 with a remainder of 170.
The next digit of our result is 6. 
Result so far: 175049.20983606
The remainder is 170 after subtracting 1830 from 2000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

The final result is 175049.20983606 with a remainder of 1.7e-07.