Let's divide 287069 by 21
The aim is to understand the frequency of 21 in 287069.

Moving on to step 1:
21 can be fit into 2 0 times, resulting in a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Append the next digit (8) from the dividend to 2 and continue with: 28 / 21

On to step 2:
28 divided by 21 is 1 with a remainder of 7.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtracting 21 from 28 leaves us with 7.
Grab the next digit (7) from the dividend, add it to 7, then carry on: 77 / 21

Moving on to step 3:
The number 21 fits into 77 3 times, leaving a remainder of 14.
Write down 3 as next digit of the result. 
Result so far: 13.0
The remainder is 14 after subtracting 63 from 77.
Fetch the next digit (0) from the dividend, attach it to 14 and continue: 140 / 21

Moving on to step 4:
140 divided by 21 is 6 with a remainder of 14.
Record the quotient 6 as the next digit in the result. 
Result so far: 136.0
If we take 126 away from 140, we end up with 14.
Bring next digit (6) of the dividend behind the 14 and repeat the process: 146 / 21

On to step 5:
146 divided by 21 is 6 with a remainder of 20.
The next digit of our result is 6. 
Result so far: 1366.0
The remainder is 20 after subtracting 126 from 146.
Fetch the next digit (9) from the dividend, attach it to 20 and continue: 209 / 21

Going ahead to step 6:
When dividing 209 by 21, we get 9 with a remainder of 20.
The next digit of our result is 9. 
Result so far: 13669.0
Deduct 189 from 209 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 7:
21 can be fit into 200 9 times, resulting in a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 13669.9
If we take 189 away from 200, we end up with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 8:
21 can be fit into 110 5 times, resulting in a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 13669.95
Subtracting 105 from 110 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 9:
50 divided by 21 is 2 with a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 13669.952
Subtract 42 from 50 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 10:
The number 21 fits into 80 3 times, leaving a remainder of 17.
Record the quotient 3 as the next digit in the result. 
Result so far: 13669.9523
Deduct 63 from 80 and we're left with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

On to step 11:
170 divided by 21 is 8 with a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 13669.95238
Deduct 168 from 170 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 12:
21 goes into 20 0 times with a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 13669.95238
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 13:
21 can be fit into 200 9 times, resulting in a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 13669.9523809
Subtracting 189 from 200 leaves us with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Going ahead to step 14:
21 goes into 110 5 times with a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 13669.95238095
Subtract 105 from 110 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Our division results in 13669.95238095 with a remaining 5e-09.