896938 divided by 21 
The aim is to understand the frequency of 21 in 896938.

Going ahead to step 1:
21 goes into 8 0 times with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Bring next digit (9) of the dividend behind the 8 and repeat the process: 89 / 21

Going ahead to step 2:
89 divided by 21 is 4 with a remainder of 5.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Subtracting 84 from 89 leaves us with 5.
Include the next digit (6) from the dividend after 5, then repeat: 56 / 21

Step 3:
The number 21 fits into 56 2 times, leaving a remainder of 14.
The next digit of our result is 2. 
Result so far: 42.0
If we take 42 away from 56, we end up with 14.
Grab the next digit (9) from the dividend, add it to 14, then carry on: 149 / 21

On to step 4:
If we divide 149 by 21, we get 7 and a remainder of 2.
Put 7 as the next digit of the answer. 
Result so far: 427.0
If we take 147 away from 149, we end up with 2.
Take the next digit (3) from the dividend and append it to 2, then repeat: 23 / 21

Step 5:
If we divide 23 by 21, we get 1 and a remainder of 2.
The next digit of our result is 1. 
Result so far: 4271.0
If we take 21 away from 23, we end up with 2.
Take the next digit (8) from the dividend and append it to 2, then repeat: 28 / 21

Advancing to step 6:
If we divide 28 by 21, we get 1 and a remainder of 7.
Record the quotient 1 as the next digit in the result. 
Result so far: 42711.0
Subtracting 21 from 28 leaves us with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Step 7:
When dividing 70 by 21, we get 3 with a remainder of 7.
Use 3 as the next digit of our solution. 
Result so far: 42711.3
The remainder is 7 after subtracting 63 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Let's proceed to step 8:
If we divide 70 by 21, we get 3 and a remainder of 7.
Put 3 as the next digit of the answer. 
Result so far: 42711.33
Deduct 63 from 70 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

After the division, we end up with 42711.33 and a remainder of 0.007.