9790502 ÷ 421 
The aim is to understand the frequency of 421 in 9790502.

Going ahead to step 1:
If we divide 9 by 421, we get 0 and a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Bring next digit (7) of the dividend behind the 9 and repeat the process: 97 / 421

Moving on to step 2:
421 goes into 97 0 times with a remainder of 97.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 97, we get 97.
Append the next digit (9) from the dividend to 97 and continue with: 979 / 421

Step 3:
The number 421 fits into 979 2 times, leaving a remainder of 137.
Use 2 as the next digit of our solution. 
Result so far: 2.0
The remainder is 137 after subtracting 842 from 979.
Append the next digit (0) from the dividend to 137 and continue with: 1370 / 421

Advancing to step 4:
When dividing 1370 by 421, we get 3 with a remainder of 107.
The next digit of our result is 3. 
Result so far: 23.0
Deduct 1263 from 1370 and we're left with 107.
Fetch the next digit (5) from the dividend, attach it to 107 and continue: 1075 / 421

On to step 5:
When dividing 1075 by 421, we get 2 with a remainder of 233.
The number 2 becomes the next digit in our result. 
Result so far: 232.0
Subtracting 842 from 1075 leaves us with 233.
Fetch the next digit (0) from the dividend, attach it to 233 and continue: 2330 / 421

Let's proceed to step 6:
2330 divided by 421 is 5 with a remainder of 225.
The number 5 becomes the next digit in our result. 
Result so far: 2325.0
Subtract 2105 from 2330 to get 225.
Take the next digit (2) from the dividend and append it to 225, then repeat: 2252 / 421

Advancing to step 7:
421 can be fit into 2252 5 times, resulting in a remainder of 147.
Use 5 as the next digit of our solution. 
Result so far: 23255.0
The remainder is 147 after subtracting 2105 from 2252.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1470, and continue the process.

Going ahead to step 8:
The number 421 fits into 1470 3 times, leaving a remainder of 207.
Use 3 as the next digit of our solution. 
Result so far: 23255.3
The remainder is 207 after subtracting 1263 from 1470.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2070, and continue the process.

Advancing to step 9:
421 can be fit into 2070 4 times, resulting in a remainder of 386.
The next digit of our result is 4. 
Result so far: 23255.34
The remainder is 386 after subtracting 1684 from 2070.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3860, and continue the process.

Going ahead to step 10:
3860 divided by 421 is 9 with a remainder of 71.
Write down 9 as next digit of the result. 
Result so far: 23255.349
If we subtract 3789 from 3860, we get 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Going ahead to step 11:
421 goes into 710 1 times with a remainder of 289.
The number 1 becomes the next digit in our result. 
Result so far: 23255.3491
The remainder is 289 after subtracting 421 from 710.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2890, and continue the process.

Let's proceed to step 12:
421 goes into 2890 6 times with a remainder of 364.
Write down 6 as next digit of the result. 
Result so far: 23255.34916
If we take 2526 away from 2890, we end up with 364.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3640, and continue the process.

Moving on to step 13:
421 goes into 3640 8 times with a remainder of 272.
Record the quotient 8 as the next digit in the result. 
Result so far: 23255.349168
If we take 3368 away from 3640, we end up with 272.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2720, and continue the process.

Advancing to step 14:
2720 divided by 421 is 6 with a remainder of 194.
Use 6 as the next digit of our solution. 
Result so far: 23255.3491686
Subtract 2526 from 2720 to get 194.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1940, and continue the process.

Let's proceed to step 15:
421 can be fit into 1940 4 times, resulting in a remainder of 256.
The next digit of our result is 4. 
Result so far: 23255.34916864
The remainder is 256 after subtracting 1684 from 1940.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2560, and continue the process.

The quotient of the division is 23255.34916864, and the remainder is 2.56e-07.