80396987 ÷ 819 
The aim is to understand the frequency of 819 in 80396987.

Step 1:
The number 819 fits into 8 0 times, leaving a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Fetch the next digit (0) from the dividend, attach it to 8 and continue: 80 / 819

Moving on to step 2:
If we divide 80 by 819, we get 0 and a remainder of 80.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 80 after subtracting 0 from 80.
Append the next digit (3) from the dividend to 80 and continue with: 803 / 819

Step 3:
If we divide 803 by 819, we get 0 and a remainder of 803.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 803 to get 803.
Grab the next digit (9) from the dividend, add it to 803, then carry on: 8039 / 819

Going ahead to step 4:
If we divide 8039 by 819, we get 9 and a remainder of 668.
The next digit of our result is 9. 
Result so far: 9.0
Deduct 7371 from 8039 and we're left with 668.
Append the next digit (6) from the dividend to 668 and continue with: 6686 / 819

Moving on to step 5:
819 goes into 6686 8 times with a remainder of 134.
Write down 8 as next digit of the result. 
Result so far: 98.0
Subtracting 6552 from 6686 leaves us with 134.
Fetch the next digit (9) from the dividend, attach it to 134 and continue: 1349 / 819

Going ahead to step 6:
1349 divided by 819 is 1 with a remainder of 530.
Use 1 as the next digit of our solution. 
Result so far: 981.0
The remainder is 530 after subtracting 819 from 1349.
Grab the next digit (8) from the dividend, add it to 530, then carry on: 5308 / 819

Let's proceed to step 7:
The number 819 fits into 5308 6 times, leaving a remainder of 394.
The next digit of our result is 6. 
Result so far: 9816.0
Subtract 4914 from 5308 to get 394.
Fetch the next digit (7) from the dividend, attach it to 394 and continue: 3947 / 819

Moving on to step 8:
If we divide 3947 by 819, we get 4 and a remainder of 671.
Use 4 as the next digit of our solution. 
Result so far: 98164.0
Deduct 3276 from 3947 and we're left with 671.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6710, and continue the process.

Going ahead to step 9:
6710 divided by 819 is 8 with a remainder of 158.
Record the quotient 8 as the next digit in the result. 
Result so far: 98164.8
Subtract 6552 from 6710 to get 158.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1580, and continue the process.

Advancing to step 10:
When dividing 1580 by 819, we get 1 with a remainder of 761.
The number 1 becomes the next digit in our result. 
Result so far: 98164.81
Deduct 819 from 1580 and we're left with 761.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7610, and continue the process.

Going ahead to step 11:
If we divide 7610 by 819, we get 9 and a remainder of 239.
Record the quotient 9 as the next digit in the result. 
Result so far: 98164.819
Deduct 7371 from 7610 and we're left with 239.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2390, and continue the process.

Let's proceed to step 12:
2390 divided by 819 is 2 with a remainder of 752.
Write down 2 as next digit of the result. 
Result so far: 98164.8192
If we subtract 1638 from 2390, we get 752.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7520, and continue the process.

Step 13:
When dividing 7520 by 819, we get 9 with a remainder of 149.
The next digit of our result is 9. 
Result so far: 98164.81929
If we take 7371 away from 7520, we end up with 149.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1490, and continue the process.

Let's proceed to step 14:
If we divide 1490 by 819, we get 1 and a remainder of 671.
Record the quotient 1 as the next digit in the result. 
Result so far: 98164.819291
If we take 819 away from 1490, we end up with 671.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6710, and continue the process.

Let's proceed to step 15:
If we divide 6710 by 819, we get 8 and a remainder of 158.
The number 8 becomes the next digit in our result. 
Result so far: 98164.8192918
Subtract 6552 from 6710 to get 158.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1580, and continue the process.

Let's proceed to step 16:
The number 819 fits into 1580 1 times, leaving a remainder of 761.
Write down 1 as next digit of the result. 
Result so far: 98164.81929181
Subtract 819 from 1580 to get 761.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7610, and continue the process.

The final outcome is 98164.81929181, with a leftover of 7.61e-07.