We look at the division of 21288610 by 679 
The aim is to understand the frequency of 679 in 21288610.

Moving on to step 1:
2 divided by 679 is 0 with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 679

Let's proceed to step 2:
679 goes into 21 0 times with a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 21 leaves us with 21.
Append the next digit (2) from the dividend to 21 and continue with: 212 / 679

Let's proceed to step 3:
If we divide 212 by 679, we get 0 and a remainder of 212.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 212, we get 212.
Include the next digit (8) from the dividend after 212, then repeat: 2128 / 679

On to step 4:
679 can be fit into 2128 3 times, resulting in a remainder of 91.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
Subtracting 2037 from 2128 leaves us with 91.
Take the next digit (8) from the dividend and append it to 91, then repeat: 918 / 679

Step 5:
The number 679 fits into 918 1 times, leaving a remainder of 239.
Use 1 as the next digit of our solution. 
Result so far: 31.0
Subtract 679 from 918 to get 239.
Include the next digit (6) from the dividend after 239, then repeat: 2396 / 679

On to step 6:
The number 679 fits into 2396 3 times, leaving a remainder of 359.
The next digit of our result is 3. 
Result so far: 313.0
If we subtract 2037 from 2396, we get 359.
Append the next digit (1) from the dividend to 359 and continue with: 3591 / 679

Advancing to step 7:
679 can be fit into 3591 5 times, resulting in a remainder of 196.
Put 5 as the next digit of the answer. 
Result so far: 3135.0
Deduct 3395 from 3591 and we're left with 196.
Include the next digit (0) from the dividend after 196, then repeat: 1960 / 679

On to step 8:
The number 679 fits into 1960 2 times, leaving a remainder of 602.
Put 2 as the next digit of the answer. 
Result so far: 31352.0
Deduct 1358 from 1960 and we're left with 602.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6020, and continue the process.

Advancing to step 9:
When dividing 6020 by 679, we get 8 with a remainder of 588.
Put 8 as the next digit of the answer. 
Result so far: 31352.8
If we subtract 5432 from 6020, we get 588.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5880, and continue the process.

Advancing to step 10:
The number 679 fits into 5880 8 times, leaving a remainder of 448.
The next digit of our result is 8. 
Result so far: 31352.88
The remainder is 448 after subtracting 5432 from 5880.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4480, and continue the process.

The quotient of the division is 31352.88, and the remainder is 0.448.