234628 divided by 21 
The aim is to understand the frequency of 21 in 234628.

Moving on to step 1:
2 divided by 21 is 0 with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Append the next digit (3) from the dividend to 2 and continue with: 23 / 21

Step 2:
When dividing 23 by 21, we get 1 with a remainder of 2.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we subtract 21 from 23, we get 2.
Include the next digit (4) from the dividend after 2, then repeat: 24 / 21

Step 3:
24 divided by 21 is 1 with a remainder of 3.
The number 1 becomes the next digit in our result. 
Result so far: 11.0
If we subtract 21 from 24, we get 3.
Grab the next digit (6) from the dividend, add it to 3, then carry on: 36 / 21

Advancing to step 4:
When dividing 36 by 21, we get 1 with a remainder of 15.
Put 1 as the next digit of the answer. 
Result so far: 111.0
The remainder is 15 after subtracting 21 from 36.
Include the next digit (2) from the dividend after 15, then repeat: 152 / 21

Advancing to step 5:
The number 21 fits into 152 7 times, leaving a remainder of 5.
Use 7 as the next digit of our solution. 
Result so far: 1117.0
The remainder is 5 after subtracting 147 from 152.
Fetch the next digit (8) from the dividend, attach it to 5 and continue: 58 / 21

Let's proceed to step 6:
When dividing 58 by 21, we get 2 with a remainder of 16.
Record the quotient 2 as the next digit in the result. 
Result so far: 11172.0
The remainder is 16 after subtracting 42 from 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Moving on to step 7:
The number 21 fits into 160 7 times, leaving a remainder of 13.
Use 7 as the next digit of our solution. 
Result so far: 11172.7
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.

Going ahead to step 8:
When dividing 130 by 21, we get 6 with a remainder of 4.
The number 6 becomes the next digit in our result. 
Result so far: 11172.76
If we subtract 126 from 130, 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.

Advancing to step 9:
When dividing 40 by 21, we get 1 with a remainder of 19.
Put 1 as the next digit of the answer. 
Result so far: 11172.761
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.

Moving on to step 10:
21 can be fit into 190 9 times, resulting in a remainder of 1.
Use 9 as the next digit of our solution. 
Result so far: 11172.7619
Deduct 189 from 190 and we're left 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.

Advancing to step 11:
21 goes into 10 0 times with a remainder of 10.
The next digit of our result is 0. 
Result so far: 11172.7619
Subtract 0 from 10 to 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.

Moving on to step 12:
When dividing 100 by 21, we get 4 with a remainder of 16.
Record the quotient 4 as the next digit in the result. 
Result so far: 11172.761904
If we subtract 84 from 100, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Step 13:
If we divide 160 by 21, we get 7 and a remainder of 13.
The number 7 becomes the next digit in our result. 
Result so far: 11172.7619047
If we take 147 away from 160, we end up 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 14:
If we divide 130 by 21, we get 6 and a remainder of 4.
Record the quotient 6 as the next digit in the result. 
Result so far: 11172.76190476
Deduct 126 from 130 and we're left 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.

The quotient of the division is 11172.76190476, and the remainder is 4e-09.