21408720 divided by 798 
The aim is to understand the frequency of 798 in 21408720.

Going ahead to step 1:
798 goes into 2 0 times with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 798

On to step 2:
798 goes into 21 0 times with a remainder of 21.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 21, we end up with 21.
Bring next digit (4) of the dividend behind the 21 and repeat the process: 214 / 798

On to step 3:
If we divide 214 by 798, we get 0 and a remainder of 214.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 214 and we're left with 214.
Take the next digit (0) from the dividend and append it to 214, then repeat: 2140 / 798

Moving on to step 4:
798 can be fit into 2140 2 times, resulting in a remainder of 544.
Use 2 as the next digit of our solution. 
Result so far: 2.0
If we take 1596 away from 2140, we end up with 544.
Include the next digit (8) from the dividend after 544, then repeat: 5448 / 798

Moving on to step 5:
When dividing 5448 by 798, we get 6 with a remainder of 660.
Record the quotient 6 as the next digit in the result. 
Result so far: 26.0
Subtracting 4788 from 5448 leaves us with 660.
Take the next digit (7) from the dividend and append it to 660, then repeat: 6607 / 798

On to step 6:
When dividing 6607 by 798, we get 8 with a remainder of 223.
Use 8 as the next digit of our solution. 
Result so far: 268.0
Subtract 6384 from 6607 to get 223.
Append the next digit (2) from the dividend to 223 and continue with: 2232 / 798

Going ahead to step 7:
798 goes into 2232 2 times with a remainder of 636.
Use 2 as the next digit of our solution. 
Result so far: 2682.0
Subtract 1596 from 2232 to get 636.
Include the next digit (0) from the dividend after 636, then repeat: 6360 / 798

Let's proceed to step 8:
798 goes into 6360 7 times with a remainder of 774.
Write down 7 as next digit of the result. 
Result so far: 26827.0
The remainder is 774 after subtracting 5586 from 6360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7740, and continue the process.

Going ahead to step 9:
The number 798 fits into 7740 9 times, leaving a remainder of 558.
Use 9 as the next digit of our solution. 
Result so far: 26827.9
Subtract 7182 from 7740 to get 558.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5580, and continue the process.

On to step 10:
798 goes into 5580 6 times with a remainder of 792.
The next digit of our result is 6. 
Result so far: 26827.96
If we take 4788 away from 5580, we end up with 792.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7920, and continue the process.

Moving on to step 11:
7920 divided by 798 is 9 with a remainder of 738.
The number 9 becomes the next digit in our result. 
Result so far: 26827.969
If we take 7182 away from 7920, we end up with 738.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7380, and continue the process.

Moving on to step 12:
If we divide 7380 by 798, we get 9 and a remainder of 198.
The next digit of our result is 9. 
Result so far: 26827.9699
Subtract 7182 from 7380 to get 198.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1980, and continue the process.

After the division, we end up with 26827.9699 and a remainder of 0.00198.