27377 divided by 21 
The aim is to understand the frequency of 21 in 27377.

Step 1:
21 can be fit into 2 0 times, resulting in a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Fetch the next digit (7) from the dividend, attach it to 2 and continue: 27 / 21

On to step 2:
The number 21 fits into 27 1 times, leaving a remainder of 6.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtracting 21 from 27 leaves us with 6.
Include the next digit (3) from the dividend after 6, then repeat: 63 / 21

On to step 3:
If we divide 63 by 21, we get 3 and a remainder of 0.
Record the quotient 3 as the next digit in the result. 
Result so far: 13.0
Subtract 63 from 63 to get 0.
Fetch the next digit (7) from the dividend, attach it to 0 and continue: 7 / 21

Let's proceed to step 4:
7 divided by 21 is 0 with a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 130.0
The remainder is 7 after subtracting 0 from 7.
Append the next digit (7) from the dividend to 7 and continue with: 77 / 21

Moving on to step 5:
The number 21 fits into 77 3 times, leaving a remainder of 14.
The next digit of our result is 3. 
Result so far: 1303.0
Deduct 63 from 77 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.

Going ahead to step 6:
The number 21 fits into 140 6 times, leaving a remainder of 14.
Put 6 as the next digit of the answer. 
Result so far: 1303.6
If we take 126 away from 140, we end up 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.

Moving on to step 7:
When dividing 140 by 21, we get 6 with a remainder of 14.
Use 6 as the next digit of our solution. 
Result so far: 1303.66
If we subtract 126 from 140, we 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.

After the division, we end up with 1303.66 and a remainder of 0.014.