91818479 ÷ 603 
The aim is to understand the frequency of 603 in 91818479.

Step 1:
The number 603 fits into 9 0 times, leaving a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Include the next digit (1) from the dividend after 9, then repeat: 91 / 603

On to step 2:
603 can be fit into 91 0 times, resulting in a remainder of 91.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 91, we end up with 91.
Bring next digit (8) of the dividend behind the 91 and repeat the process: 918 / 603

Advancing to step 3:
918 divided by 603 is 1 with a remainder of 315.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtracting 603 from 918 leaves us with 315.
Bring next digit (1) of the dividend behind the 315 and repeat the process: 3151 / 603

Advancing to step 4:
603 can be fit into 3151 5 times, resulting in a remainder of 136.
The next digit of our result is 5. 
Result so far: 15.0
Deduct 3015 from 3151 and we're left with 136.
Append the next digit (8) from the dividend to 136 and continue with: 1368 / 603

On to step 5:
1368 divided by 603 is 2 with a remainder of 162.
Write down 2 as next digit of the result. 
Result so far: 152.0
Subtract 1206 from 1368 to get 162.
Fetch the next digit (4) from the dividend, attach it to 162 and continue: 1624 / 603

Moving on to step 6:
When dividing 1624 by 603, we get 2 with a remainder of 418.
Use 2 as the next digit of our solution. 
Result so far: 1522.0
The remainder is 418 after subtracting 1206 from 1624.
Take the next digit (7) from the dividend and append it to 418, then repeat: 4187 / 603

Going ahead to step 7:
603 can be fit into 4187 6 times, resulting in a remainder of 569.
Use 6 as the next digit of our solution. 
Result so far: 15226.0
If we subtract 3618 from 4187, we get 569.
Grab the next digit (9) from the dividend, add it to 569, then carry on: 5699 / 603

Going ahead to step 8:
5699 divided by 603 is 9 with a remainder of 272.
Put 9 as the next digit of the answer. 
Result so far: 152269.0
Deduct 5427 from 5699 and we're left with 272.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2720, and continue the process.

Step 9:
2720 divided by 603 is 4 with a remainder of 308.
Use 4 as the next digit of our solution. 
Result so far: 152269.4
The remainder is 308 after subtracting 2412 from 2720.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3080, and continue the process.

Moving on to step 10:
3080 divided by 603 is 5 with a remainder of 65.
Record the quotient 5 as the next digit in the result. 
Result so far: 152269.45
If we take 3015 away from 3080, we end up with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Going ahead to step 11:
603 can be fit into 650 1 times, resulting in a remainder of 47.
The next digit of our result is 1. 
Result so far: 152269.451
Subtracting 603 from 650 leaves us with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Advancing to step 12:
603 goes into 470 0 times with a remainder of 470.
Use 0 as the next digit of our solution. 
Result so far: 152269.451
Subtracting 0 from 470 leaves us with 470.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4700, and continue the process.

Step 13:
The number 603 fits into 4700 7 times, leaving a remainder of 479.
Record the quotient 7 as the next digit in the result. 
Result so far: 152269.45107
If we subtract 4221 from 4700, we get 479.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4790, and continue the process.

Going ahead to step 14:
603 goes into 4790 7 times with a remainder of 569.
The number 7 becomes the next digit in our result. 
Result so far: 152269.451077
Subtracting 4221 from 4790 leaves us with 569.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5690, and continue the process.

The final outcome is 152269.451077, with a leftover of 5.69e-05.