76312591 ÷ 599 
The aim is to understand the frequency of 599 in 76312591.

Let's proceed to step 1:
If we divide 7 by 599, we get 0 and a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Append the next digit (6) from the dividend to 7 and continue with: 76 / 599

Advancing to step 2:
599 can be fit into 76 0 times, resulting in a remainder of 76.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 76 after subtracting 0 from 76.
Bring next digit (3) of the dividend behind the 76 and repeat the process: 763 / 599

Moving on to step 3:
The number 599 fits into 763 1 times, leaving a remainder of 164.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we take 599 away from 763, we end up with 164.
Grab the next digit (1) from the dividend, add it to 164, then carry on: 1641 / 599

Advancing to step 4:
If we divide 1641 by 599, we get 2 and a remainder of 443.
The next digit of our result is 2. 
Result so far: 12.0
The remainder is 443 after subtracting 1198 from 1641.
Take the next digit (2) from the dividend and append it to 443, then repeat: 4432 / 599

Going ahead to step 5:
4432 divided by 599 is 7 with a remainder of 239.
Write down 7 as next digit of the result. 
Result so far: 127.0
Deduct 4193 from 4432 and we're left with 239.
Grab the next digit (5) from the dividend, add it to 239, then carry on: 2395 / 599

Going ahead to step 6:
If we divide 2395 by 599, we get 3 and a remainder of 598.
Use 3 as the next digit of our solution. 
Result so far: 1273.0
The remainder is 598 after subtracting 1797 from 2395.
Fetch the next digit (9) from the dividend, attach it to 598 and continue: 5989 / 599

Going ahead to step 7:
When dividing 5989 by 599, we get 9 with a remainder of 598.
Put 9 as the next digit of the answer. 
Result so far: 12739.0
Subtract 5391 from 5989 to get 598.
Include the next digit (1) from the dividend after 598, then repeat: 5981 / 599

Moving on to step 8:
If we divide 5981 by 599, we get 9 and a remainder of 590.
Put 9 as the next digit of the answer. 
Result so far: 127399.0
If we take 5391 away from 5981, we end up with 590.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5900, and continue the process.

On to step 9:
599 can be fit into 5900 9 times, resulting in a remainder of 509.
Record the quotient 9 as the next digit in the result. 
Result so far: 127399.9
Deduct 5391 from 5900 and we're left with 509.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5090, and continue the process.

On to step 10:
599 goes into 5090 8 times with a remainder of 298.
Record the quotient 8 as the next digit in the result. 
Result so far: 127399.98
Deduct 4792 from 5090 and we're left with 298.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2980, and continue the process.

Going ahead to step 11:
If we divide 2980 by 599, we get 4 and a remainder of 584.
Put 4 as the next digit of the answer. 
Result so far: 127399.984
Deduct 2396 from 2980 and we're left with 584.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5840, and continue the process.

Going ahead to step 12:
599 can be fit into 5840 9 times, resulting in a remainder of 449.
Record the quotient 9 as the next digit in the result. 
Result so far: 127399.9849
Deduct 5391 from 5840 and we're left 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.

Advancing to step 13:
599 can be fit into 4490 7 times, resulting in a remainder of 297.
Record the quotient 7 as the next digit in the result. 
Result so far: 127399.98497
Subtracting 4193 from 4490 leaves us with 297.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2970, and continue the process.

On to step 14:
599 can be fit into 2970 4 times, resulting in a remainder of 574.
Use 4 as the next digit of our solution. 
Result so far: 127399.984974
If we take 2396 away from 2970, we end up with 574.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5740, and continue the process.

Moving on to step 15:
599 can be fit into 5740 9 times, resulting in a remainder of 349.
The number 9 becomes the next digit in our result. 
Result so far: 127399.9849749
If we take 5391 away from 5740, we end up with 349.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3490, and continue the process.

Let's proceed to step 16:
When dividing 3490 by 599, we get 5 with a remainder of 495.
The next digit of our result is 5. 
Result so far: 127399.98497495
If we subtract 2995 from 3490, we get 495.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4950, and continue the process.

The final outcome is 127399.98497495, with a leftover of 4.95e-07.