699861 ÷ 21 
The aim is to understand the frequency of 21 in 699861.

Going ahead to step 1:
The number 21 fits into 6 0 times, leaving a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Append the next digit (9) from the dividend to 6 and continue with: 69 / 21

Going ahead to step 2:
21 can be fit into 69 3 times, resulting in a remainder of 6.
Use 3 as the next digit of our solution. 
Result so far: 3.0
If we take 63 away from 69, we end up with 6.
Grab the next digit (9) from the dividend, add it to 6, then carry on: 69 / 21

Step 3:
21 goes into 69 3 times with a remainder of 6.
Write down 3 as next digit of the result. 
Result so far: 33.0
Subtract 63 from 69 to get 6.
Append the next digit (8) from the dividend to 6 and continue with: 68 / 21

Advancing to step 4:
If we divide 68 by 21, we get 3 and a remainder of 5.
Put 3 as the next digit of the answer. 
Result so far: 333.0
Deduct 63 from 68 and we're left with 5.
Take the next digit (6) from the dividend and append it to 5, then repeat: 56 / 21

Step 5:
If we divide 56 by 21, we get 2 and a remainder of 14.
Use 2 as the next digit of our solution. 
Result so far: 3332.0
If we subtract 42 from 56, we get 14.
Append the next digit (1) from the dividend to 14 and continue with: 141 / 21

On to step 6:
When dividing 141 by 21, we get 6 with a remainder of 15.
The next digit of our result is 6. 
Result so far: 33326.0
If we subtract 126 from 141, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 7:
21 goes into 150 7 times with a remainder of 3.
Write down 7 as next digit of the result. 
Result so far: 33326.7
Subtracting 147 from 150 leaves us with 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 8:
The number 21 fits into 30 1 times, leaving a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 33326.71
Subtracting 21 from 30 leaves us 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.

Moving on to step 9:
90 divided by 21 is 4 with a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 33326.714
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.

Going ahead to step 10:
If we divide 60 by 21, we get 2 and a remainder of 18.
The next digit of our result is 2. 
Result so far: 33326.7142
The remainder is 18 after subtracting 42 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 11:
21 goes into 180 8 times with a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 33326.71428
Subtracting 168 from 180 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 12:
21 goes into 120 5 times with a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 33326.714285
Deduct 105 from 120 and we're left 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.

Step 13:
The number 21 fits into 150 7 times, leaving a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 33326.7142857
Subtract 147 from 150 to 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 14:
When dividing 30 by 21, we get 1 with a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 33326.71428571
The remainder is 9 after subtracting 21 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

After the division, we end up with 33326.71428571 and a remainder of 9e-09.