We look at the division of 90742851 by 509 
We want to figure out the number of times 90742851 can be divided by 509.

Let's proceed to step 1:
The number 509 fits into 9 0 times, leaving a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 9 after subtracting 0 from 9.
Bring next digit (0) of the dividend behind the 9 and repeat the process: 90 / 509

Step 2:
When dividing 90 by 509, we get 0 with a remainder of 90.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 90, we get 90.
Grab the next digit (7) from the dividend, add it to 90, then carry on: 907 / 509

Advancing to step 3:
The number 509 fits into 907 1 times, leaving a remainder of 398.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 509 from 907, we get 398.
Grab the next digit (4) from the dividend, add it to 398, then carry on: 3984 / 509

On to step 4:
The number 509 fits into 3984 7 times, leaving a remainder of 421.
The number 7 becomes the next digit in our result. 
Result so far: 17.0
If we subtract 3563 from 3984, we get 421.
Include the next digit (2) from the dividend after 421, then repeat: 4212 / 509

Going ahead to step 5:
509 can be fit into 4212 8 times, resulting in a remainder of 140.
Record the quotient 8 as the next digit in the result. 
Result so far: 178.0
Subtract 4072 from 4212 to get 140.
Append the next digit (8) from the dividend to 140 and continue with: 1408 / 509

On to step 6:
If we divide 1408 by 509, we get 2 and a remainder of 390.
The next digit of our result is 2. 
Result so far: 1782.0
The remainder is 390 after subtracting 1018 from 1408.
Include the next digit (5) from the dividend after 390, then repeat: 3905 / 509

Advancing to step 7:
3905 divided by 509 is 7 with a remainder of 342.
Record the quotient 7 as the next digit in the result. 
Result so far: 17827.0
Subtract 3563 from 3905 to get 342.
Include the next digit (1) from the dividend after 342, then repeat: 3421 / 509

Let's proceed to step 8:
If we divide 3421 by 509, we get 6 and a remainder of 367.
Put 6 as the next digit of the answer. 
Result so far: 178276.0
Subtracting 3054 from 3421 leaves us with 367.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3670, and continue the process.

On to step 9:
If we divide 3670 by 509, we get 7 and a remainder of 107.
Put 7 as the next digit of the answer. 
Result so far: 178276.7
Subtracting 3563 from 3670 leaves us with 107.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1070, and continue the process.

Going ahead to step 10:
1070 divided by 509 is 2 with a remainder of 52.
The next digit of our result is 2. 
Result so far: 178276.72
Subtracting 1018 from 1070 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.

On to step 11:
When dividing 520 by 509, we get 1 with a remainder of 11.
Put 1 as the next digit of the answer. 
Result so far: 178276.721
Subtract 509 from 520 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Moving on to step 12:
509 goes into 110 0 times with a remainder of 110.
The next digit of our result is 0. 
Result so far: 178276.721
If we subtract 0 from 110, we get 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Moving on to step 13:
509 goes into 1100 2 times with a remainder of 82.
The next digit of our result is 2. 
Result so far: 178276.72102
If we take 1018 away from 1100, we end up with 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Advancing to step 14:
When dividing 820 by 509, we get 1 with a remainder of 311.
Write down 1 as next digit of the result. 
Result so far: 178276.721021
The remainder is 311 after subtracting 509 from 820.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3110, and continue the process.

Let's proceed to step 15:
509 goes into 3110 6 times with a remainder of 56.
Use 6 as the next digit of our solution. 
Result so far: 178276.7210216
If we take 3054 away from 3110, we end up with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

On to step 16:
560 divided by 509 is 1 with a remainder of 51.
Record the quotient 1 as the next digit in the result. 
Result so far: 178276.72102161
Deduct 509 from 560 and we're left with 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

The final outcome is 178276.72102161, with a leftover of 5.1e-08.