Let's divide 148869 by 21
The aim is to understand the frequency of 21 in 148869.

Let's proceed to step 1:
When dividing 1 by 21, we get 0 with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Include the next digit (4) from the dividend after 1, then repeat: 14 / 21

Step 2:
14 divided by 21 is 0 with a remainder of 14.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 14 and we're left with 14.
Fetch the next digit (8) from the dividend, attach it to 14 and continue: 148 / 21

Going ahead to step 3:
The number 21 fits into 148 7 times, leaving a remainder of 1.
Use 7 as the next digit of our solution. 
Result so far: 7.0
Deduct 147 from 148 and we're left with 1.
Grab the next digit (8) from the dividend, add it to 1, then carry on: 18 / 21

On to step 4:
If we divide 18 by 21, we get 0 and a remainder of 18.
Put 0 as the next digit of the answer. 
Result so far: 70.0
Deduct 0 from 18 and we're left with 18.
Grab the next digit (6) from the dividend, add it to 18, then carry on: 186 / 21

Advancing to step 5:
186 divided by 21 is 8 with a remainder of 18.
Record the quotient 8 as the next digit in the result. 
Result so far: 708.0
The remainder is 18 after subtracting 168 from 186.
Grab the next digit (9) from the dividend, add it to 18, then carry on: 189 / 21

Step 6:
If we divide 189 by 21, we get 9 and a remainder of 0.
Use 9 as the next digit of our solution. 
Result so far: 7089.0
If we take 189 away from 189, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 7:
21 can be fit into 0 0 times, resulting in a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 7089.0
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 8:
0 divided by 21 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 7089.0
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The quotient of the division is 7089.0, and the remainder is 0.0.