21375815 ÷ 344 
The aim is to understand the frequency of 344 in 21375815.

Advancing to step 1:
If we divide 2 by 344, we get 0 and a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 344

Moving on to step 2:
When dividing 21 by 344, we get 0 with a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 21 to get 21.
Include the next digit (3) from the dividend after 21, then repeat: 213 / 344

Advancing to step 3:
213 divided by 344 is 0 with a remainder of 213.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 213, we end up with 213.
Take the next digit (7) from the dividend and append it to 213, then repeat: 2137 / 344

Going ahead to step 4:
When dividing 2137 by 344, we get 6 with a remainder of 73.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
If we take 2064 away from 2137, we end up with 73.
Append the next digit (5) from the dividend to 73 and continue with: 735 / 344

Going ahead to step 5:
The number 344 fits into 735 2 times, leaving a remainder of 47.
The next digit of our result is 2. 
Result so far: 62.0
Deduct 688 from 735 and we're left with 47.
Take the next digit (8) from the dividend and append it to 47, then repeat: 478 / 344

Advancing to step 6:
478 divided by 344 is 1 with a remainder of 134.
The number 1 becomes the next digit in our result. 
Result so far: 621.0
If we take 344 away from 478, we end up with 134.
Take the next digit (1) from the dividend and append it to 134, then repeat: 1341 / 344

Step 7:
If we divide 1341 by 344, we get 3 and a remainder of 309.
The next digit of our result is 3. 
Result so far: 6213.0
Deduct 1032 from 1341 and we're left with 309.
Fetch the next digit (5) from the dividend, attach it to 309 and continue: 3095 / 344

Step 8:
3095 divided by 344 is 8 with a remainder of 343.
The next digit of our result is 8. 
Result so far: 62138.0
Subtracting 2752 from 3095 leaves us with 343.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3430, and continue the process.

Let's proceed to step 9:
344 can be fit into 3430 9 times, resulting in a remainder of 334.
Write down 9 as next digit of the result. 
Result so far: 62138.9
Subtracting 3096 from 3430 leaves us with 334.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3340, and continue the process.

Advancing to step 10:
The number 344 fits into 3340 9 times, leaving a remainder of 244.
Write down 9 as next digit of the result. 
Result so far: 62138.99
Deduct 3096 from 3340 and we're left with 244.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2440, and continue the process.

In conclusion, the division gives 62138.99 with a balance of 0.244.