We're dividing 21709543 by 988 
The aim is to understand the frequency of 988 in 21709543.

Advancing to step 1:
The number 988 fits into 2 0 times, leaving 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.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 988

Step 2:
21 divided by 988 is 0 with a remainder of 21.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 21, we end up with 21.
Take the next digit (7) from the dividend and append it to 21, then repeat: 217 / 988

Moving on to step 3:
988 can be fit into 217 0 times, resulting in a remainder of 217.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 217 after subtracting 0 from 217.
Bring next digit (0) of the dividend behind the 217 and repeat the process: 2170 / 988

On to step 4:
988 goes into 2170 2 times with a remainder of 194.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Deduct 1976 from 2170 and we're left with 194.
Fetch the next digit (9) from the dividend, attach it to 194 and continue: 1949 / 988

Advancing to step 5:
988 goes into 1949 1 times with a remainder of 961.
The next digit of our result is 1. 
Result so far: 21.0
Subtracting 988 from 1949 leaves us with 961.
Fetch the next digit (5) from the dividend, attach it to 961 and continue: 9615 / 988

Advancing to step 6:
When dividing 9615 by 988, we get 9 with a remainder of 723.
Use 9 as the next digit of our solution. 
Result so far: 219.0
Subtract 8892 from 9615 to get 723.
Bring next digit (4) of the dividend behind the 723 and repeat the process: 7234 / 988

Step 7:
988 can be fit into 7234 7 times, resulting in a remainder of 318.
Write down 7 as next digit of the result. 
Result so far: 2197.0
The remainder is 318 after subtracting 6916 from 7234.
Take the next digit (3) from the dividend and append it to 318, then repeat: 3183 / 988

Going ahead to step 8:
988 can be fit into 3183 3 times, resulting in a remainder of 219.
Write down 3 as next digit of the result. 
Result so far: 21973.0
Subtract 2964 from 3183 to get 219.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2190, and continue the process.

Let's proceed to step 9:
If we divide 2190 by 988, we get 2 and a remainder of 214.
Use 2 as the next digit of our solution. 
Result so far: 21973.2
Subtracting 1976 from 2190 leaves us with 214.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2140, and continue the process.

Advancing to step 10:
988 can be fit into 2140 2 times, resulting in a remainder of 164.
The number 2 becomes the next digit in our result. 
Result so far: 21973.22
If we take 1976 away from 2140, we end up with 164.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1640, and continue the process.

The final outcome is 21973.22, with a leftover of 0.164.