10025803 divided by 819 
The aim is to understand the frequency of 819 in 10025803.

Step 1:
819 goes into 1 0 times with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Take the next digit (0) from the dividend and append it to 1, then repeat: 10 / 819

Advancing to step 2:
The number 819 fits into 10 0 times, leaving a remainder of 10.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 10, we get 10.
Include the next digit (0) from the dividend after 10, then repeat: 100 / 819

Advancing to step 3:
819 can be fit into 100 0 times, resulting in a remainder of 100.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 100 to get 100.
Bring next digit (2) of the dividend behind the 100 and repeat the process: 1002 / 819

Going ahead to step 4:
819 goes into 1002 1 times with a remainder of 183.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 819 from 1002 to get 183.
Grab the next digit (5) from the dividend, add it to 183, then carry on: 1835 / 819

Let's proceed to step 5:
1835 divided by 819 is 2 with a remainder of 197.
Put 2 as the next digit of the answer. 
Result so far: 12.0
Deduct 1638 from 1835 and we're left with 197.
Grab the next digit (8) from the dividend, add it to 197, then carry on: 1978 / 819

Advancing to step 6:
The number 819 fits into 1978 2 times, leaving a remainder of 340.
Write down 2 as next digit of the result. 
Result so far: 122.0
Deduct 1638 from 1978 and we're left with 340.
Bring next digit (0) of the dividend behind the 340 and repeat the process: 3400 / 819

Step 7:
819 goes into 3400 4 times with a remainder of 124.
Put 4 as the next digit of the answer. 
Result so far: 1224.0
If we take 3276 away from 3400, we end up with 124.
Grab the next digit (3) from the dividend, add it to 124, then carry on: 1243 / 819

Moving on to step 8:
When dividing 1243 by 819, we get 1 with a remainder of 424.
The number 1 becomes the next digit in our result. 
Result so far: 12241.0
If we take 819 away from 1243, we end up with 424.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4240, and continue the process.

Let's proceed to step 9:
If we divide 4240 by 819, we get 5 and a remainder of 145.
Write down 5 as next digit of the result. 
Result so far: 12241.5
If we take 4095 away from 4240, we end up with 145.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1450, and continue the process.

Let's proceed to step 10:
819 goes into 1450 1 times with a remainder of 631.
The next digit of our result is 1. 
Result so far: 12241.51
If we subtract 819 from 1450, we get 631.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6310, and continue the process.

On to step 11:
6310 divided by 819 is 7 with a remainder of 577.
Put 7 as the next digit of the answer. 
Result so far: 12241.517
Subtract 5733 from 6310 to get 577.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5770, and continue the process.

Advancing to step 12:
5770 divided by 819 is 7 with a remainder of 37.
Put 7 as the next digit of the answer. 
Result so far: 12241.5177
If we subtract 5733 from 5770, we get 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

After the division, we end up with 12241.5177 and a remainder of 0.00037.