We're dividing 78191831 by 903 
The aim is to understand the frequency of 903 in 78191831.

On to step 1:
7 divided by 903 is 0 with a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Take the next digit (8) from the dividend and append it to 7, then repeat: 78 / 903

Let's proceed to step 2:
903 goes into 78 0 times with a remainder of 78.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 78 to get 78.
Include the next digit (1) from the dividend after 78, then repeat: 781 / 903

Advancing to step 3:
903 can be fit into 781 0 times, resulting in a remainder of 781.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 781 after subtracting 0 from 781.
Take the next digit (9) from the dividend and append it to 781, then repeat: 7819 / 903

Step 4:
903 can be fit into 7819 8 times, resulting in a remainder of 595.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
The remainder is 595 after subtracting 7224 from 7819.
Append the next digit (1) from the dividend to 595 and continue with: 5951 / 903

Moving on to step 5:
If we divide 5951 by 903, we get 6 and a remainder of 533.
Write down 6 as next digit of the result. 
Result so far: 86.0
Subtracting 5418 from 5951 leaves us with 533.
Append the next digit (8) from the dividend to 533 and continue with: 5338 / 903

Going ahead to step 6:
5338 divided by 903 is 5 with a remainder of 823.
Put 5 as the next digit of the answer. 
Result so far: 865.0
If we take 4515 away from 5338, we end up with 823.
Bring next digit (3) of the dividend behind the 823 and repeat the process: 8233 / 903

Going ahead to step 7:
903 can be fit into 8233 9 times, resulting in a remainder of 106.
The number 9 becomes the next digit in our result. 
Result so far: 8659.0
If we subtract 8127 from 8233, we get 106.
Grab the next digit (1) from the dividend, add it to 106, then carry on: 1061 / 903

Moving on to step 8:
903 can be fit into 1061 1 times, resulting in a remainder of 158.
Use 1 as the next digit of our solution. 
Result so far: 86591.0
Subtracting 903 from 1061 leaves us with 158.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1580, and continue the process.

Moving on to step 9:
903 can be fit into 1580 1 times, resulting in a remainder of 677.
Put 1 as the next digit of the answer. 
Result so far: 86591.1
Subtracting 903 from 1580 leaves us with 677.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6770, and continue the process.

Step 10:
6770 divided by 903 is 7 with a remainder of 449.
The number 7 becomes the next digit in our result. 
Result so far: 86591.17
Subtracting 6321 from 6770 leaves us with 449.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4490, and continue the process.

Moving on to step 11:
903 can be fit into 4490 4 times, resulting in a remainder of 878.
The next digit of our result is 4. 
Result so far: 86591.174
Deduct 3612 from 4490 and we're left with 878.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8780, and continue the process.

Advancing to step 12:
8780 divided by 903 is 9 with a remainder of 653.
The next digit of our result is 9. 
Result so far: 86591.1749
If we take 8127 away from 8780, we end up with 653.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6530, and continue the process.

Moving on to step 13:
The number 903 fits into 6530 7 times, leaving a remainder of 209.
Record the quotient 7 as the next digit in the result. 
Result so far: 86591.17497
If we take 6321 away from 6530, we end up with 209.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2090, and continue the process.

Let's proceed to step 14:
903 can be fit into 2090 2 times, resulting in a remainder of 284.
Put 2 as the next digit of the answer. 
Result so far: 86591.174972
If we take 1806 away from 2090, we end up with 284.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2840, and continue the process.

On to step 15:
The number 903 fits into 2840 3 times, leaving a remainder of 131.
Write down 3 as next digit of the result. 
Result so far: 86591.1749723
Deduct 2709 from 2840 and we're left with 131.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1310, and continue the process.

Moving on to step 16:
903 can be fit into 1310 1 times, resulting in a remainder of 407.
Record the quotient 1 as the next digit in the result. 
Result so far: 86591.17497231
If we take 903 away from 1310, we end up with 407.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4070, and continue the process.

The quotient of the division is 86591.17497231, and the remainder is 4.07e-07.