Let's divide 7330036 by 21
The aim is to understand the frequency of 21 in 7330036.

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
If we subtract 0 from 7, we get 7.
Take the next digit (3) from the dividend and append it to 7, then repeat: 73 / 21

On to step 2:
When dividing 73 by 21, we get 3 with a remainder of 10.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
Subtract 63 from 73 to get 10.
Fetch the next digit (3) from the dividend, attach it to 10 and continue: 103 / 21

Step 3:
21 can be fit into 103 4 times, resulting in a remainder of 19.
The number 4 becomes the next digit in our result. 
Result so far: 34.0
If we take 84 away from 103, we end up with 19.
Include the next digit (0) from the dividend after 19, then repeat: 190 / 21

Advancing to step 4:
190 divided by 21 is 9 with a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 349.0
If we take 189 away from 190, we end up with 1.
Take the next digit (0) from the dividend and append it to 1, then repeat: 10 / 21

Let's proceed to step 5:
21 can be fit into 10 0 times, resulting in a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 3490.0
Deduct 0 from 10 and we're left with 10.
Append the next digit (3) from the dividend to 10 and continue with: 103 / 21

Going ahead to step 6:
The number 21 fits into 103 4 times, leaving a remainder of 19.
The number 4 becomes the next digit in our result. 
Result so far: 34904.0
Subtract 84 from 103 to get 19.
Append the next digit (6) from the dividend to 19 and continue with: 196 / 21

Advancing to step 7:
When dividing 196 by 21, we get 9 with a remainder of 7.
Use 9 as the next digit of our solution. 
Result so far: 349049.0
Deduct 189 from 196 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

On to step 8:
70 divided by 21 is 3 with a remainder of 7.
Record the quotient 3 as the next digit in the result. 
Result so far: 349049.3
The remainder is 7 after subtracting 63 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Going ahead to step 9:
21 goes into 70 3 times with a remainder of 7.
Write down 3 as next digit of the result. 
Result so far: 349049.33
Deduct 63 from 70 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

The final outcome is 349049.33, with a leftover of 0.007.