We divide 94128535 by 21
The aim is to understand the frequency of 21 in 94128535.

Advancing to step 1:
If we divide 9 by 21, we get 0 and a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Take the next digit (4) from the dividend and append it to 9, then repeat: 94 / 21

Going ahead to step 2:
94 divided by 21 is 4 with a remainder of 10.
The next digit of our result is 4. 
Result so far: 4.0
The remainder is 10 after subtracting 84 from 94.
Include the next digit (1) from the dividend after 10, then repeat: 101 / 21

Going ahead to step 3:
21 can be fit into 101 4 times, resulting in a remainder of 17.
Write down 4 as next digit of the result. 
Result so far: 44.0
Deduct 84 from 101 and we're left with 17.
Include the next digit (2) from the dividend after 17, then repeat: 172 / 21

Step 4:
The number 21 fits into 172 8 times, leaving a remainder of 4.
Put 8 as the next digit of the answer. 
Result so far: 448.0
Deduct 168 from 172 and we're left with 4.
Take the next digit (8) from the dividend and append it to 4, then repeat: 48 / 21

Moving on to step 5:
48 divided by 21 is 2 with a remainder of 6.
Record the quotient 2 as the next digit in the result. 
Result so far: 4482.0
The remainder is 6 after subtracting 42 from 48.
Grab the next digit (5) from the dividend, add it to 6, then carry on: 65 / 21

Moving on to step 6:
If we divide 65 by 21, we get 3 and a remainder of 2.
Put 3 as the next digit of the answer. 
Result so far: 44823.0
The remainder is 2 after subtracting 63 from 65.
Take the next digit (3) from the dividend and append it to 2, then repeat: 23 / 21

On to step 7:
23 divided by 21 is 1 with a remainder of 2.
Write down 1 as next digit of the result. 
Result so far: 448231.0
Deduct 21 from 23 and we're left with 2.
Include the next digit (5) from the dividend after 2, then repeat: 25 / 21

Let's proceed to step 8:
21 can be fit into 25 1 times, resulting in a remainder of 4.
The next digit of our result is 1. 
Result so far: 4482311.0
Subtracting 21 from 25 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 9:
The number 21 fits into 40 1 times, leaving a remainder of 19.
The number 1 becomes the next digit in our result. 
Result so far: 4482311.1
Deduct 21 from 40 and we're left with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Advancing to step 10:
190 divided by 21 is 9 with a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 4482311.19
Deduct 189 from 190 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Moving on to step 11:
When dividing 10 by 21, we get 0 with a remainder of 10.
The next digit of our result is 0. 
Result so far: 4482311.19
If we subtract 0 from 10, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 12:
When dividing 100 by 21, we get 4 with a remainder of 16.
Write down 4 as next digit of the result. 
Result so far: 4482311.1904
Deduct 84 from 100 and we're left with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 13:
21 goes into 160 7 times with a remainder of 13.
The next digit of our result is 7. 
Result so far: 4482311.19047
Subtract 147 from 160 to get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Advancing to step 14:
21 can be fit into 130 6 times, resulting in a remainder of 4.
Put 6 as the next digit of the answer. 
Result so far: 4482311.190476
Subtracting 126 from 130 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 15:
21 goes into 40 1 times with a remainder of 19.
The number 1 becomes the next digit in our result. 
Result so far: 4482311.1904761
If we take 21 away from 40, we end up with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Let's proceed to step 16:
If we divide 190 by 21, we get 9 and a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 4482311.19047619
Deduct 189 from 190 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Our division results in 4482311.19047619 with a remaining 1e-09.