621345 divided by 37 
The aim is to understand the frequency of 37 in 621345.

Let's proceed to step 1:
37 can be fit into 6 0 times, resulting in a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Append the next digit (2) from the dividend to 6 and continue with: 62 / 37

Going ahead to step 2:
If we divide 62 by 37, we get 1 and a remainder of 25.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 25 after subtracting 37 from 62.
Take the next digit (1) from the dividend and append it to 25, then repeat: 251 / 37

On to step 3:
If we divide 251 by 37, we get 6 and a remainder of 29.
The number 6 becomes the next digit in our result. 
Result so far: 16.0
Subtracting 222 from 251 leaves us with 29.
Append the next digit (3) from the dividend to 29 and continue with: 293 / 37

Advancing to step 4:
The number 37 fits into 293 7 times, leaving a remainder of 34.
Write down 7 as next digit of the result. 
Result so far: 167.0
Subtracting 259 from 293 leaves us with 34.
Bring next digit (4) of the dividend behind the 34 and repeat the process: 344 / 37

Moving on to step 5:
344 divided by 37 is 9 with a remainder of 11.
The next digit of our result is 9. 
Result so far: 1679.0
The remainder is 11 after subtracting 333 from 344.
Bring next digit (5) of the dividend behind the 11 and repeat the process: 115 / 37

Advancing to step 6:
37 goes into 115 3 times with a remainder of 4.
Record the quotient 3 as the next digit in the result. 
Result so far: 16793.0
If we subtract 111 from 115, 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.

On to step 7:
37 can be fit into 40 1 times, resulting in a remainder of 3.
Write down 1 as next digit of the result. 
Result so far: 16793.1
If we subtract 37 from 40, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 8:
37 can be fit into 30 0 times, resulting in a remainder of 30.
The next digit of our result is 0. 
Result so far: 16793.1
Deduct 0 from 30 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 9:
The number 37 fits into 300 8 times, leaving a remainder of 4.
The number 8 becomes the next digit in our result. 
Result so far: 16793.108
The remainder is 4 after subtracting 296 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 10:
The number 37 fits into 40 1 times, leaving a remainder of 3.
The number 1 becomes the next digit in our result. 
Result so far: 16793.1081
Deduct 37 from 40 and we're left 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.

Let's proceed to step 11:
30 divided by 37 is 0 with a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 16793.1081
If we subtract 0 from 30, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Advancing to step 12:
37 can be fit into 300 8 times, resulting in a remainder of 4.
Use 8 as the next digit of our solution. 
Result so far: 16793.108108
Subtract 296 from 300 to 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.

Advancing to step 13:
The number 37 fits into 40 1 times, leaving a remainder of 3.
Put 1 as the next digit of the answer. 
Result so far: 16793.1081081
If we subtract 37 from 40, we get 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 14:
37 goes into 30 0 times with a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 16793.1081081
The remainder is 30 after subtracting 0 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

The final outcome is 16793.1081081, with a leftover of 3e-08.