81931448 ÷ 600 
The aim is to understand the frequency of 600 in 81931448.

Step 1:
When dividing 8 by 600, we get 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Append the next digit (1) from the dividend to 8 and continue with: 81 / 600

Advancing to step 2:
81 divided by 600 is 0 with a remainder of 81.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 81 after subtracting 0 from 81.
Bring next digit (9) of the dividend behind the 81 and repeat the process: 819 / 600

On to step 3:
600 goes into 819 1 times with a remainder of 219.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 600 from 819 leaves us with 219.
Take the next digit (3) from the dividend and append it to 219, then repeat: 2193 / 600

Going ahead to step 4:
The number 600 fits into 2193 3 times, leaving a remainder of 393.
The number 3 becomes the next digit in our result. 
Result so far: 13.0
The remainder is 393 after subtracting 1800 from 2193.
Append the next digit (1) from the dividend to 393 and continue with: 3931 / 600

On to step 5:
3931 divided by 600 is 6 with a remainder of 331.
Record the quotient 6 as the next digit in the result. 
Result so far: 136.0
Subtracting 3600 from 3931 leaves us with 331.
Include the next digit (4) from the dividend after 331, then repeat: 3314 / 600

Going ahead to step 6:
3314 divided by 600 is 5 with a remainder of 314.
Use 5 as the next digit of our solution. 
Result so far: 1365.0
Subtracting 3000 from 3314 leaves us with 314.
Take the next digit (4) from the dividend and append it to 314, then repeat: 3144 / 600

Step 7:
If we divide 3144 by 600, we get 5 and a remainder of 144.
Record the quotient 5 as the next digit in the result. 
Result so far: 13655.0
Deduct 3000 from 3144 and we're left with 144.
Append the next digit (8) from the dividend to 144 and continue with: 1448 / 600

Going ahead to step 8:
1448 divided by 600 is 2 with a remainder of 248.
Write down 2 as next digit of the result. 
Result so far: 136552.0
If we subtract 1200 from 1448, we get 248.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2480, and continue the process.

Going ahead to step 9:
The number 600 fits into 2480 4 times, leaving a remainder of 80.
Put 4 as the next digit of the answer. 
Result so far: 136552.4
The remainder is 80 after subtracting 2400 from 2480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Step 10:
The number 600 fits into 800 1 times, leaving a remainder of 200.
Use 1 as the next digit of our solution. 
Result so far: 136552.41
Subtracting 600 from 800 leaves us with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

On to step 11:
600 can be fit into 2000 3 times, resulting in a remainder of 200.
Use 3 as the next digit of our solution. 
Result so far: 136552.413
If we take 1800 away from 2000, we end up with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Let's proceed to step 12:
When dividing 2000 by 600, we get 3 with a remainder of 200.
Use 3 as the next digit of our solution. 
Result so far: 136552.4133
Deduct 1800 from 2000 and we're left with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

After the division, we end up with 136552.4133 and a remainder of 0.002.