We look at the division of 521953 by 37 
The aim is to understand the frequency of 37 in 521953.

On to step 1:
When dividing 5 by 37, we get 0 with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Bring next digit (2) of the dividend behind the 5 and repeat the process: 52 / 37

Advancing to step 2:
When dividing 52 by 37, we get 1 with a remainder of 15.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Deduct 37 from 52 and we're left with 15.
Append the next digit (1) from the dividend to 15 and continue with: 151 / 37

On to step 3:
If we divide 151 by 37, we get 4 and a remainder of 3.
Write down 4 as next digit of the result. 
Result so far: 14.0
If we take 148 away from 151, we end up with 3.
Grab the next digit (9) from the dividend, add it to 3, then carry on: 39 / 37

Step 4:
If we divide 39 by 37, we get 1 and a remainder of 2.
Write down 1 as next digit of the result. 
Result so far: 141.0
If we subtract 37 from 39, we get 2.
Fetch the next digit (5) from the dividend, attach it to 2 and continue: 25 / 37

Step 5:
The number 37 fits into 25 0 times, leaving a remainder of 25.
Write down 0 as next digit of the result. 
Result so far: 1410.0
Deduct 0 from 25 and we're left with 25.
Grab the next digit (3) from the dividend, add it to 25, then carry on: 253 / 37

Moving on to step 6:
37 goes into 253 6 times with a remainder of 31.
The number 6 becomes the next digit in our result. 
Result so far: 14106.0
Subtract 222 from 253 to get 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Advancing to step 7:
37 can be fit into 310 8 times, resulting in a remainder of 14.
The next digit of our result is 8. 
Result so far: 14106.8
Subtract 296 from 310 to get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Step 8:
When dividing 140 by 37, we get 3 with a remainder of 29.
Write down 3 as next digit of the result. 
Result so far: 14106.83
Deduct 111 from 140 and we're left with 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Let's proceed to step 9:
When dividing 290 by 37, we get 7 with a remainder of 31.
Write down 7 as next digit of the result. 
Result so far: 14106.837
Subtract 259 from 290 to get 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

On to step 10:
310 divided by 37 is 8 with a remainder of 14.
Write down 8 as next digit of the result. 
Result so far: 14106.8378
Subtract 296 from 310 to get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Advancing to step 11:
The number 37 fits into 140 3 times, leaving a remainder of 29.
Record the quotient 3 as the next digit in the result. 
Result so far: 14106.83783
Subtract 111 from 140 to get 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Step 12:
When dividing 290 by 37, we get 7 with a remainder of 31.
Use 7 as the next digit of our solution. 
Result so far: 14106.837837
Subtracting 259 from 290 leaves us with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Step 13:
310 divided by 37 is 8 with a remainder of 14.
Write down 8 as next digit of the result. 
Result so far: 14106.8378378
Deduct 296 from 310 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Advancing to step 14:
37 goes into 140 3 times with a remainder of 29.
Put 3 as the next digit of the answer. 
Result so far: 14106.83783783
The remainder is 29 after subtracting 111 from 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

The final result is 14106.83783783 with a remainder of 2.9e-08.