21262394 ÷ 987 
The aim is to understand the frequency of 987 in 21262394.

On to step 1:
The number 987 fits into 2 0 times, leaving a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 987

Step 2:
If we divide 21 by 987, we get 0 and 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.
Include the next digit (2) from the dividend after 21, then repeat: 212 / 987

Going ahead to step 3:
987 can be fit into 212 0 times, resulting in a remainder of 212.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 212 leaves us with 212.
Append the next digit (6) from the dividend to 212 and continue with: 2126 / 987

On to step 4:
The number 987 fits into 2126 2 times, leaving a remainder of 152.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we subtract 1974 from 2126, we get 152.
Grab the next digit (2) from the dividend, add it to 152, then carry on: 1522 / 987

Moving on to step 5:
The number 987 fits into 1522 1 times, leaving a remainder of 535.
The next digit of our result is 1. 
Result so far: 21.0
If we take 987 away from 1522, we end up with 535.
Grab the next digit (3) from the dividend, add it to 535, then carry on: 5353 / 987

Advancing to step 6:
The number 987 fits into 5353 5 times, leaving a remainder of 418.
Use 5 as the next digit of our solution. 
Result so far: 215.0
If we subtract 4935 from 5353, we get 418.
Grab the next digit (9) from the dividend, add it to 418, then carry on: 4189 / 987

Step 7:
987 goes into 4189 4 times with a remainder of 241.
Put 4 as the next digit of the answer. 
Result so far: 2154.0
Subtract 3948 from 4189 to get 241.
Bring next digit (4) of the dividend behind the 241 and repeat the process: 2414 / 987

Advancing to step 8:
The number 987 fits into 2414 2 times, leaving a remainder of 440.
The next digit of our result is 2. 
Result so far: 21542.0
Subtracting 1974 from 2414 leaves us with 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4400, and continue the process.

Advancing to step 9:
The number 987 fits into 4400 4 times, leaving a remainder of 452.
Put 4 as the next digit of the answer. 
Result so far: 21542.4
Subtract 3948 from 4400 to get 452.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4520, and continue the process.

Moving on to step 10:
4520 divided by 987 is 4 with a remainder of 572.
The number 4 becomes the next digit in our result. 
Result so far: 21542.44
Subtract 3948 from 4520 to get 572.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5720, and continue the process.

Our division results in 21542.44 with a remaining 0.572.