Let's divide 88881993 by 421
The aim is to understand the frequency of 421 in 88881993.

Advancing to step 1:
If we divide 8 by 421, we get 0 and a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Fetch the next digit (8) from the dividend, attach it to 8 and continue: 88 / 421

Going ahead to step 2:
421 goes into 88 0 times with a remainder of 88.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 88, we end up with 88.
Bring next digit (8) of the dividend behind the 88 and repeat the process: 888 / 421

Let's proceed to step 3:
888 divided by 421 is 2 with a remainder of 46.
Use 2 as the next digit of our solution. 
Result so far: 2.0
The remainder is 46 after subtracting 842 from 888.
Grab the next digit (8) from the dividend, add it to 46, then carry on: 468 / 421

Going ahead to step 4:
If we divide 468 by 421, we get 1 and a remainder of 47.
Use 1 as the next digit of our solution. 
Result so far: 21.0
Subtracting 421 from 468 leaves us with 47.
Fetch the next digit (1) from the dividend, attach it to 47 and continue: 471 / 421

Let's proceed to step 5:
The number 421 fits into 471 1 times, leaving a remainder of 50.
The number 1 becomes the next digit in our result. 
Result so far: 211.0
Subtracting 421 from 471 leaves us with 50.
Grab the next digit (9) from the dividend, add it to 50, then carry on: 509 / 421

Let's proceed to step 6:
If we divide 509 by 421, we get 1 and a remainder of 88.
Use 1 as the next digit of our solution. 
Result so far: 2111.0
If we subtract 421 from 509, we get 88.
Grab the next digit (9) from the dividend, add it to 88, then carry on: 889 / 421

On to step 7:
889 divided by 421 is 2 with a remainder of 47.
Record the quotient 2 as the next digit in the result. 
Result so far: 21112.0
The remainder is 47 after subtracting 842 from 889.
Grab the next digit (3) from the dividend, add it to 47, then carry on: 473 / 421

Going ahead to step 8:
The number 421 fits into 473 1 times, leaving a remainder of 52.
Write down 1 as next digit of the result. 
Result so far: 211121.0
If we take 421 away from 473, we end up with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Going ahead to step 9:
If we divide 520 by 421, we get 1 and a remainder of 99.
The number 1 becomes the next digit in our result. 
Result so far: 211121.1
Deduct 421 from 520 and we're left with 99.
Since there are no more digits in the dividend, we add a zero to the remainder making it 990, and continue the process.

Let's proceed to step 10:
When dividing 990 by 421, we get 2 with a remainder of 148.
Write down 2 as next digit of the result. 
Result so far: 211121.12
Deduct 842 from 990 and we're left with 148.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1480, and continue the process.

Moving on to step 11:
If we divide 1480 by 421, we get 3 and a remainder of 217.
Write down 3 as next digit of the result. 
Result so far: 211121.123
The remainder is 217 after subtracting 1263 from 1480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2170, and continue the process.

Advancing to step 12:
2170 divided by 421 is 5 with a remainder of 65.
Record the quotient 5 as the next digit in the result. 
Result so far: 211121.1235
Subtracting 2105 from 2170 leaves us with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Going ahead to step 13:
The number 421 fits into 650 1 times, leaving a remainder of 229.
Write down 1 as next digit of the result. 
Result so far: 211121.12351
The remainder is 229 after subtracting 421 from 650.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2290, and continue the process.

On to step 14:
421 goes into 2290 5 times with a remainder of 185.
The number 5 becomes the next digit in our result. 
Result so far: 211121.123515
The remainder is 185 after subtracting 2105 from 2290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1850, and continue the process.

Going ahead to step 15:
When dividing 1850 by 421, we get 4 with a remainder of 166.
Write down 4 as next digit of the result. 
Result so far: 211121.1235154
Deduct 1684 from 1850 and we're left with 166.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1660, and continue the process.

Let's proceed to step 16:
The number 421 fits into 1660 3 times, leaving a remainder of 397.
The number 3 becomes the next digit in our result. 
Result so far: 211121.12351543
If we subtract 1263 from 1660, we get 397.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3970, and continue the process.

The final result is 211121.12351543 with a remainder of 3.97e-07.