We divide 758049 by 21
The aim is to understand the frequency of 21 in 758049.

Moving on to step 1:
If we divide 7 by 21, we get 0 and a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Bring next digit (5) of the dividend behind the 7 and repeat the process: 75 / 21

Going ahead to step 2:
21 goes into 75 3 times with a remainder of 12.
Use 3 as the next digit of our solution. 
Result so far: 3.0
If we take 63 away from 75, we end up with 12.
Include the next digit (8) from the dividend after 12, then repeat: 128 / 21

Advancing to step 3:
128 divided by 21 is 6 with a remainder of 2.
The number 6 becomes the next digit in our result. 
Result so far: 36.0
Subtracting 126 from 128 leaves us with 2.
Bring next digit (0) of the dividend behind the 2 and repeat the process: 20 / 21

Moving on to step 4:
21 can be fit into 20 0 times, resulting in a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 360.0
If we subtract 0 from 20, we get 20.
Bring next digit (4) of the dividend behind the 20 and repeat the process: 204 / 21

Let's proceed to step 5:
21 can be fit into 204 9 times, resulting in a remainder of 15.
Record the quotient 9 as the next digit in the result. 
Result so far: 3609.0
Subtracting 189 from 204 leaves us with 15.
Grab the next digit (9) from the dividend, add it to 15, then carry on: 159 / 21

Advancing to step 6:
159 divided by 21 is 7 with a remainder of 12.
The next digit of our result is 7. 
Result so far: 36097.0
The remainder is 12 after subtracting 147 from 159.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 7:
If we divide 120 by 21, we get 5 and a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 36097.5
If we subtract 105 from 120, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 8:
The number 21 fits into 150 7 times, leaving a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 36097.57
If we take 147 away from 150, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 9:
21 can be fit into 30 1 times, resulting in a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 36097.571
If we subtract 21 from 30, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 10:
If we divide 90 by 21, we get 4 and a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 36097.5714
If we subtract 84 from 90, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 11:
21 goes into 60 2 times with a remainder of 18.
The next digit of our result is 2. 
Result so far: 36097.57142
Subtract 42 from 60 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Step 12:
When dividing 180 by 21, we get 8 with a remainder of 12.
The next digit of our result is 8. 
Result so far: 36097.571428
If we subtract 168 from 180, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 13:
If we divide 120 by 21, we get 5 and a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 36097.5714285
If we take 105 away from 120, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 14:
When dividing 150 by 21, we get 7 with a remainder of 3.
The next digit of our result is 7. 
Result so far: 36097.57142857
Subtracting 147 from 150 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Our division results in 36097.57142857 with a remaining 3e-09.