We're dividing 85970349 by 421 
The aim is to understand the frequency of 421 in 85970349.

Moving on to step 1:
When dividing 8 by 421, we get 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Bring next digit (5) of the dividend behind the 8 and repeat the process: 85 / 421

Let's proceed to step 2:
85 divided by 421 is 0 with a remainder of 85.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 85, we end up with 85.
Grab the next digit (9) from the dividend, add it to 85, then carry on: 859 / 421

Going ahead to step 3:
If we divide 859 by 421, we get 2 and a remainder of 17.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we take 842 away from 859, we end up with 17.
Include the next digit (7) from the dividend after 17, then repeat: 177 / 421

Let's proceed to step 4:
The number 421 fits into 177 0 times, leaving a remainder of 177.
The number 0 becomes the next digit in our result. 
Result so far: 20.0
Subtracting 0 from 177 leaves us with 177.
Append the next digit (0) from the dividend to 177 and continue with: 1770 / 421

On to step 5:
The number 421 fits into 1770 4 times, leaving a remainder of 86.
The next digit of our result is 4. 
Result so far: 204.0
Subtract 1684 from 1770 to get 86.
Bring next digit (3) of the dividend behind the 86 and repeat the process: 863 / 421

On to step 6:
863 divided by 421 is 2 with a remainder of 21.
The next digit of our result is 2. 
Result so far: 2042.0
If we subtract 842 from 863, we get 21.
Include the next digit (4) from the dividend after 21, then repeat: 214 / 421

Let's proceed to step 7:
If we divide 214 by 421, we get 0 and a remainder of 214.
Put 0 as the next digit of the answer. 
Result so far: 20420.0
Subtract 0 from 214 to get 214.
Grab the next digit (9) from the dividend, add it to 214, then carry on: 2149 / 421

Advancing to step 8:
When dividing 2149 by 421, we get 5 with a remainder of 44.
Use 5 as the next digit of our solution. 
Result so far: 204205.0
Subtracting 2105 from 2149 leaves us with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Going ahead to step 9:
421 can be fit into 440 1 times, resulting in a remainder of 19.
Use 1 as the next digit of our solution. 
Result so far: 204205.1
The remainder is 19 after subtracting 421 from 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Moving on to step 10:
190 divided by 421 is 0 with a remainder of 190.
Use 0 as the next digit of our solution. 
Result so far: 204205.1
Subtract 0 from 190 to get 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1900, and continue the process.

Let's proceed to step 11:
When dividing 1900 by 421, we get 4 with a remainder of 216.
The number 4 becomes the next digit in our result. 
Result so far: 204205.104
Deduct 1684 from 1900 and we're left with 216.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2160, and continue the process.

Going ahead to step 12:
421 can be fit into 2160 5 times, resulting in a remainder of 55.
The next digit of our result is 5. 
Result so far: 204205.1045
If we subtract 2105 from 2160, we get 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Advancing to step 13:
The number 421 fits into 550 1 times, leaving a remainder of 129.
Record the quotient 1 as the next digit in the result. 
Result so far: 204205.10451
The remainder is 129 after subtracting 421 from 550.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1290, and continue the process.

Moving on to step 14:
If we divide 1290 by 421, we get 3 and a remainder of 27.
Record the quotient 3 as the next digit in the result. 
Result so far: 204205.104513
If we take 1263 away from 1290, we end up with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

On to step 15:
The number 421 fits into 270 0 times, leaving a remainder of 270.
Write down 0 as next digit of the result. 
Result so far: 204205.104513
Deduct 0 from 270 and we're left with 270.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2700, and continue the process.

Moving on to step 16:
The number 421 fits into 2700 6 times, leaving a remainder of 174.
Record the quotient 6 as the next digit in the result. 
Result so far: 204205.10451306
Subtracting 2526 from 2700 leaves us with 174.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1740, and continue the process.

The quotient of the division is 204205.10451306, and the remainder is 1.74e-07.