We look at the division of 70560721 by 819 
The aim is to understand the frequency of 819 in 70560721.

Step 1:
If we divide 7 by 819, we get 0 and a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Take the next digit (0) from the dividend and append it to 7, then repeat: 70 / 819

Step 2:
70 divided by 819 is 0 with a remainder of 70.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 70, we end up with 70.
Grab the next digit (5) from the dividend, add it to 70, then carry on: 705 / 819

On to step 3:
If we divide 705 by 819, we get 0 and a remainder of 705.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 705, we get 705.
Bring next digit (6) of the dividend behind the 705 and repeat the process: 7056 / 819

On to step 4:
If we divide 7056 by 819, we get 8 and a remainder of 504.
The next digit of our result is 8. 
Result so far: 8.0
The remainder is 504 after subtracting 6552 from 7056.
Bring next digit (0) of the dividend behind the 504 and repeat the process: 5040 / 819

Let's proceed to step 5:
When dividing 5040 by 819, we get 6 with a remainder of 126.
Use 6 as the next digit of our solution. 
Result so far: 86.0
Subtract 4914 from 5040 to get 126.
Take the next digit (7) from the dividend and append it to 126, then repeat: 1267 / 819

Moving on to step 6:
819 goes into 1267 1 times with a remainder of 448.
Write down 1 as next digit of the result. 
Result so far: 861.0
If we take 819 away from 1267, we end up with 448.
Grab the next digit (2) from the dividend, add it to 448, then carry on: 4482 / 819

Moving on to step 7:
819 can be fit into 4482 5 times, resulting in a remainder of 387.
Put 5 as the next digit of the answer. 
Result so far: 8615.0
If we subtract 4095 from 4482, we get 387.
Include the next digit (1) from the dividend after 387, then repeat: 3871 / 819

Let's proceed to step 8:
819 can be fit into 3871 4 times, resulting in a remainder of 595.
Record the quotient 4 as the next digit in the result. 
Result so far: 86154.0
Deduct 3276 from 3871 and we're left with 595.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5950, and continue the process.

Step 9:
819 goes into 5950 7 times with a remainder of 217.
Use 7 as the next digit of our solution. 
Result so far: 86154.7
Deduct 5733 from 5950 and we're left with 217.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2170, and continue the process.

On to step 10:
2170 divided by 819 is 2 with a remainder of 532.
Record the quotient 2 as the next digit in the result. 
Result so far: 86154.72
Subtract 1638 from 2170 to get 532.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5320, and continue the process.

Moving on to step 11:
819 can be fit into 5320 6 times, resulting in a remainder of 406.
Put 6 as the next digit of the answer. 
Result so far: 86154.726
The remainder is 406 after subtracting 4914 from 5320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4060, and continue the process.

Moving on to step 12:
819 goes into 4060 4 times with a remainder of 784.
Put 4 as the next digit of the answer. 
Result so far: 86154.7264
Subtract 3276 from 4060 to get 784.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7840, and continue the process.

Moving on to step 13:
819 can be fit into 7840 9 times, resulting in a remainder of 469.
Use 9 as the next digit of our solution. 
Result so far: 86154.72649
If we subtract 7371 from 7840, we get 469.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4690, and continue the process.

Advancing to step 14:
When dividing 4690 by 819, we get 5 with a remainder of 595.
Record the quotient 5 as the next digit in the result. 
Result so far: 86154.726495
Subtracting 4095 from 4690 leaves us with 595.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5950, and continue the process.

Advancing to step 15:
The number 819 fits into 5950 7 times, leaving a remainder of 217.
The next digit of our result is 7. 
Result so far: 86154.7264957
Subtract 5733 from 5950 to get 217.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2170, and continue the process.

On to step 16:
819 can be fit into 2170 2 times, resulting in a remainder of 532.
Use 2 as the next digit of our solution. 
Result so far: 86154.72649572
If we take 1638 away from 2170, we end up with 532.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5320, and continue the process.

The final outcome is 86154.72649572, with a leftover of 5.32e-07.