We're dividing 7870421 by 223 
The aim is to understand the frequency of 223 in 7870421.

Moving on to step 1:
223 can be fit into 7 0 times, resulting in a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Take the next digit (8) from the dividend and append it to 7, then repeat: 78 / 223

Moving on to step 2:
When dividing 78 by 223, we get 0 with a remainder of 78.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 78 leaves us with 78.
Take the next digit (7) from the dividend and append it to 78, then repeat: 787 / 223

Moving on to step 3:
787 divided by 223 is 3 with a remainder of 118.
Use 3 as the next digit of our solution. 
Result so far: 3.0
If we subtract 669 from 787, we get 118.
Bring next digit (0) of the dividend behind the 118 and repeat the process: 1180 / 223

Let's proceed to step 4:
When dividing 1180 by 223, we get 5 with a remainder of 65.
The number 5 becomes the next digit in our result. 
Result so far: 35.0
If we subtract 1115 from 1180, we get 65.
Grab the next digit (4) from the dividend, add it to 65, then carry on: 654 / 223

Let's proceed to step 5:
When dividing 654 by 223, we get 2 with a remainder of 208.
Put 2 as the next digit of the answer. 
Result so far: 352.0
Subtract 446 from 654 to get 208.
Fetch the next digit (2) from the dividend, attach it to 208 and continue: 2082 / 223

Let's proceed to step 6:
If we divide 2082 by 223, we get 9 and a remainder of 75.
Record the quotient 9 as the next digit in the result. 
Result so far: 3529.0
If we subtract 2007 from 2082, we get 75.
Bring next digit (1) of the dividend behind the 75 and repeat the process: 751 / 223

On to step 7:
751 divided by 223 is 3 with a remainder of 82.
The next digit of our result is 3. 
Result so far: 35293.0
Subtract 669 from 751 to get 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Let's proceed to step 8:
If we divide 820 by 223, we get 3 and a remainder of 151.
Use 3 as the next digit of our solution. 
Result so far: 35293.3
Subtract 669 from 820 to get 151.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1510, and continue the process.

Let's proceed to step 9:
223 can be fit into 1510 6 times, resulting in a remainder of 172.
Record the quotient 6 as the next digit in the result. 
Result so far: 35293.36
The remainder is 172 after subtracting 1338 from 1510.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1720, and continue the process.

Moving on to step 10:
When dividing 1720 by 223, we get 7 with a remainder of 159.
Record the quotient 7 as the next digit in the result. 
Result so far: 35293.367
Subtracting 1561 from 1720 leaves us with 159.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1590, and continue the process.

Moving on to step 11:
223 goes into 1590 7 times with a remainder of 29.
Record the quotient 7 as the next digit in the result. 
Result so far: 35293.3677
If we subtract 1561 from 1590, we get 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

The final result is 35293.3677 with a remainder of 0.00029.