Let's divide 37037803 by 21
The aim is to understand the frequency of 21 in 37037803.

Moving on to step 1:
If we divide 3 by 21, we get 0 and a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Include the next digit (7) from the dividend after 3, then repeat: 37 / 21

Moving on to step 2:
The number 21 fits into 37 1 times, leaving a remainder of 16.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 21 from 37 and we're left with 16.
Include the next digit (0) from the dividend after 16, then repeat: 160 / 21

Moving on to step 3:
The number 21 fits into 160 7 times, leaving a remainder of 13.
Write down 7 as next digit of the result. 
Result so far: 17.0
If we subtract 147 from 160, we get 13.
Include the next digit (3) from the dividend after 13, then repeat: 133 / 21

Going ahead to step 4:
If we divide 133 by 21, we get 6 and a remainder of 7.
Use 6 as the next digit of our solution. 
Result so far: 176.0
If we subtract 126 from 133, we get 7.
Take the next digit (7) from the dividend and append it to 7, then repeat: 77 / 21

Let's proceed to step 5:
77 divided by 21 is 3 with a remainder of 14.
The number 3 becomes the next digit in our result. 
Result so far: 1763.0
If we subtract 63 from 77, we get 14.
Append the next digit (8) from the dividend to 14 and continue with: 148 / 21

Advancing to step 6:
21 goes into 148 7 times with a remainder of 1.
Put 7 as the next digit of the answer. 
Result so far: 17637.0
Subtract 147 from 148 to get 1.
Bring next digit (0) of the dividend behind the 1 and repeat the process: 10 / 21

Moving on to step 7:
21 goes into 10 0 times with a remainder of 10.
The next digit of our result is 0. 
Result so far: 176370.0
If we subtract 0 from 10, we get 10.
Include the next digit (3) from the dividend after 10, then repeat: 103 / 21

Moving on to step 8:
If we divide 103 by 21, we get 4 and a remainder of 19.
Put 4 as the next digit of the answer. 
Result so far: 1763704.0
The remainder is 19 after subtracting 84 from 103.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

On to step 9:
When dividing 190 by 21, we get 9 with a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 1763704.9
The remainder is 1 after subtracting 189 from 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 10:
21 goes into 10 0 times with a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 1763704.9
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 11:
When dividing 100 by 21, we get 4 with a remainder of 16.
The next digit of our result is 4. 
Result so far: 1763704.904
If we subtract 84 from 100, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Going ahead to step 12:
When dividing 160 by 21, we get 7 with a remainder of 13.
Write down 7 as next digit of the result. 
Result so far: 1763704.9047
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.

Going ahead to step 13:
21 can be fit into 130 6 times, resulting in a remainder of 4.
The number 6 becomes the next digit in our result. 
Result so far: 1763704.90476
If we subtract 126 from 130, we get 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 14:
21 can be fit into 40 1 times, resulting in a remainder of 19.
Use 1 as the next digit of our solution. 
Result so far: 1763704.904761
The remainder is 19 after subtracting 21 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Step 15:
If we divide 190 by 21, we get 9 and a remainder of 1.
The next digit of our result is 9. 
Result so far: 1763704.9047619
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 16:
The number 21 fits into 10 0 times, leaving a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 1763704.9047619
If we take 0 away from 10, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

In conclusion, the division gives 1763704.9047619 with a balance of 1e-08.