Let's divide 521720 by 37
The aim is to understand the frequency of 37 in 521720.

Step 1:
If we divide 5 by 37, we get 0 and a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Grab the next digit (2) from the dividend, add it to 5, then carry on: 52 / 37

Moving on to step 2:
When dividing 52 by 37, we get 1 with a remainder of 15.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 37 from 52 leaves us with 15.
Take the next digit (1) from the dividend and append it to 15, then repeat: 151 / 37

Moving on to step 3:
37 can be fit into 151 4 times, resulting in a remainder of 3.
The next digit of our result is 4. 
Result so far: 14.0
Deduct 148 from 151 and we're left with 3.
Bring next digit (7) of the dividend behind the 3 and repeat the process: 37 / 37

Step 4:
37 divided by 37 is 1 with a remainder of 0.
Use 1 as the next digit of our solution. 
Result so far: 141.0
Subtract 37 from 37 to get 0.
Bring next digit (2) of the dividend behind the 0 and repeat the process: 2 / 37

Let's proceed to step 5:
37 can be fit into 2 0 times, resulting in a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 1410.0
Subtract 0 from 2 to get 2.
Append the next digit (0) from the dividend to 2 and continue with: 20 / 37

On to step 6:
The number 37 fits into 20 0 times, leaving a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 14100.0
If we subtract 0 from 20, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 7:
When dividing 200 by 37, we get 5 with a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 14100.5
Subtract 185 from 200 to 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.

Step 8:
37 goes into 150 4 times with a remainder of 2.
Use 4 as the next digit of our solution. 
Result so far: 14100.54
Subtract 148 from 150 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 9:
37 goes into 20 0 times with a remainder of 20.
The next digit of our result is 0. 
Result so far: 14100.54
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 10:
37 can be fit into 200 5 times, resulting in a remainder of 15.
The next digit of our result is 5. 
Result so far: 14100.5405
Subtracting 185 from 200 leaves us 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 11:
37 goes into 150 4 times with a remainder of 2.
Put 4 as the next digit of the answer. 
Result so far: 14100.54054
If we take 148 away from 150, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 12:
When dividing 20 by 37, we get 0 with a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 14100.54054
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 13:
200 divided by 37 is 5 with a remainder of 15.
The next digit of our result is 5. 
Result so far: 14100.5405405
Deduct 185 from 200 and we're left 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.

Moving on to step 14:
The number 37 fits into 150 4 times, leaving a remainder of 2.
Write down 4 as next digit of the result. 
Result so far: 14100.54054054
If we subtract 148 from 150, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

In conclusion, the division gives 14100.54054054 with a balance of 2e-09.