We divide 946651 by 21
The aim is to understand the frequency of 21 in 946651.

Moving on to step 1:
9 divided by 21 is 0 with a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Bring next digit (4) of the dividend behind the 9 and repeat the process: 94 / 21

Advancing to step 2:
If we divide 94 by 21, we get 4 and a remainder of 10.
Write down 4 as next digit of the result. 
Result so far: 4.0
Subtracting 84 from 94 leaves us with 10.
Grab the next digit (6) from the dividend, add it to 10, then carry on: 106 / 21

Going ahead to step 3:
If we divide 106 by 21, we get 5 and a remainder of 1.
The number 5 becomes the next digit in our result. 
Result so far: 45.0
Subtracting 105 from 106 leaves us with 1.
Bring next digit (6) of the dividend behind the 1 and repeat the process: 16 / 21

Advancing to step 4:
21 goes into 16 0 times with a remainder of 16.
The number 0 becomes the next digit in our result. 
Result so far: 450.0
Subtract 0 from 16 to get 16.
Grab the next digit (5) from the dividend, add it to 16, then carry on: 165 / 21

Advancing to step 5:
The number 21 fits into 165 7 times, leaving a remainder of 18.
The number 7 becomes the next digit in our result. 
Result so far: 4507.0
The remainder is 18 after subtracting 147 from 165.
Append the next digit (1) from the dividend to 18 and continue with: 181 / 21

Going ahead to step 6:
21 can be fit into 181 8 times, resulting in a remainder of 13.
Write down 8 as next digit of the result. 
Result so far: 45078.0
The remainder is 13 after subtracting 168 from 181.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Step 7:
The number 21 fits into 130 6 times, leaving a remainder of 4.
Put 6 as the next digit of the answer. 
Result so far: 45078.6
Subtract 126 from 130 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.

On to step 8:
21 can be fit into 40 1 times, resulting in a remainder of 19.
Use 1 as the next digit of our solution. 
Result so far: 45078.61
Deduct 21 from 40 and we're left with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Moving on to step 9:
The number 21 fits into 190 9 times, leaving a remainder of 1.
Record the quotient 9 as the next digit in the result. 
Result so far: 45078.619
Subtracting 189 from 190 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 10:
If we divide 10 by 21, we get 0 and a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 45078.619
If we subtract 0 from 10, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 11:
21 can be fit into 100 4 times, resulting in a remainder of 16.
Use 4 as the next digit of our solution. 
Result so far: 45078.61904
The remainder is 16 after subtracting 84 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Let's proceed to step 12:
If we divide 160 by 21, we get 7 and a remainder of 13.
Record the quotient 7 as the next digit in the result. 
Result so far: 45078.619047
Deduct 147 from 160 and we're left with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Moving on to step 13:
130 divided by 21 is 6 with a remainder of 4.
Record the quotient 6 as the next digit in the result. 
Result so far: 45078.6190476
Subtracting 126 from 130 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 14:
If we divide 40 by 21, we get 1 and a remainder of 19.
The number 1 becomes the next digit in our result. 
Result so far: 45078.61904761
If we take 21 away from 40, we end up with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Our division results in 45078.61904761 with a remaining 1.9e-08.