We divide 186477 by 21
The aim is to understand the frequency of 21 in 186477.

Step 1:
21 goes into 1 0 times with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Take the next digit (8) from the dividend and append it to 1, then repeat: 18 / 21

Let's proceed to step 2:
The number 21 fits into 18 0 times, leaving a remainder of 18.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 18, we end up with 18.
Append the next digit (6) from the dividend to 18 and continue with: 186 / 21

Advancing to step 3:
If we divide 186 by 21, we get 8 and a remainder of 18.
The next digit of our result is 8. 
Result so far: 8.0
Subtracting 168 from 186 leaves us with 18.
Include the next digit (4) from the dividend after 18, then repeat: 184 / 21

Step 4:
If we divide 184 by 21, we get 8 and a remainder of 16.
Use 8 as the next digit of our solution. 
Result so far: 88.0
Subtract 168 from 184 to get 16.
Fetch the next digit (7) from the dividend, attach it to 16 and continue: 167 / 21

Let's proceed to step 5:
167 divided by 21 is 7 with a remainder of 20.
Write down 7 as next digit of the result. 
Result so far: 887.0
Subtracting 147 from 167 leaves us with 20.
Include the next digit (7) from the dividend after 20, then repeat: 207 / 21

Advancing to step 6:
21 goes into 207 9 times with a remainder of 18.
Write down 9 as next digit of the result. 
Result so far: 8879.0
Subtract 189 from 207 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Step 7:
180 divided by 21 is 8 with a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 8879.8
Subtract 168 from 180 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 8:
If we divide 120 by 21, we get 5 and a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 8879.85
The remainder is 15 after subtracting 105 from 120.
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 9:
The number 21 fits into 150 7 times, leaving a remainder of 3.
Write down 7 as next digit of the result. 
Result so far: 8879.857
If we subtract 147 from 150, 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 10:
When dividing 30 by 21, we get 1 with a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 8879.8571
Deduct 21 from 30 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Advancing to step 11:
90 divided by 21 is 4 with a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 8879.85714
If we take 84 away from 90, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 12:
When dividing 60 by 21, we get 2 with a remainder of 18.
The next digit of our result is 2. 
Result so far: 8879.857142
If we take 42 away from 60, we end up with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Advancing to step 13:
180 divided by 21 is 8 with a remainder of 12.
The next digit of our result is 8. 
Result so far: 8879.8571428
Subtract 168 from 180 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 14:
120 divided by 21 is 5 with a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 8879.85714285
If we take 105 away from 120, we end up 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.

After the division, we end up with 8879.85714285 and a remainder of 1.5e-08.