903143 divided by 91 
The aim is to understand the frequency of 91 in 903143.

Moving on to step 1:
When dividing 9 by 91, we get 0 with a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Fetch the next digit (0) from the dividend, attach it to 9 and continue: 90 / 91

Advancing to step 2:
The number 91 fits into 90 0 times, leaving a remainder of 90.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 90 and we're left with 90.
Fetch the next digit (3) from the dividend, attach it to 90 and continue: 903 / 91

Let's proceed to step 3:
91 goes into 903 9 times with a remainder of 84.
The number 9 becomes the next digit in our result. 
Result so far: 9.0
The remainder is 84 after subtracting 819 from 903.
Fetch the next digit (1) from the dividend, attach it to 84 and continue: 841 / 91

On to step 4:
The number 91 fits into 841 9 times, leaving a remainder of 22.
The number 9 becomes the next digit in our result. 
Result so far: 99.0
Subtracting 819 from 841 leaves us with 22.
Take the next digit (4) from the dividend and append it to 22, then repeat: 224 / 91

Step 5:
The number 91 fits into 224 2 times, leaving a remainder of 42.
Write down 2 as next digit of the result. 
Result so far: 992.0
If we take 182 away from 224, we end up with 42.
Fetch the next digit (3) from the dividend, attach it to 42 and continue: 423 / 91

On to step 6:
The number 91 fits into 423 4 times, leaving a remainder of 59.
Use 4 as the next digit of our solution. 
Result so far: 9924.0
If we subtract 364 from 423, we get 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Step 7:
91 goes into 590 6 times with a remainder of 44.
Put 6 as the next digit of the answer. 
Result so far: 9924.6
Deduct 546 from 590 and we're left with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Step 8:
91 goes into 440 4 times with a remainder of 76.
Use 4 as the next digit of our solution. 
Result so far: 9924.64
The remainder is 76 after subtracting 364 from 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

On to step 9:
91 can be fit into 760 8 times, resulting in a remainder of 32.
The next digit of our result is 8. 
Result so far: 9924.648
If we subtract 728 from 760, we get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Step 10:
If we divide 320 by 91, we get 3 and a remainder of 47.
Write down 3 as next digit of the result. 
Result so far: 9924.6483
Subtract 273 from 320 to get 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Going ahead to step 11:
The number 91 fits into 470 5 times, leaving a remainder of 15.
The next digit of our result is 5. 
Result so far: 9924.64835
If we take 455 away from 470, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 12:
91 goes into 150 1 times with a remainder of 59.
Record the quotient 1 as the next digit in the result. 
Result so far: 9924.648351
If we take 91 away from 150, we end up with 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Moving on to step 13:
590 divided by 91 is 6 with a remainder of 44.
Write down 6 as next digit of the result. 
Result so far: 9924.6483516
Subtract 546 from 590 to get 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Going ahead to step 14:
If we divide 440 by 91, we get 4 and a remainder of 76.
Put 4 as the next digit of the answer. 
Result so far: 9924.64835164
The remainder is 76 after subtracting 364 from 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

The final outcome is 9924.64835164, with a leftover of 7.6e-08.