Let's divide 21107252 by 661
The aim is to understand the frequency of 661 in 21107252.

Step 1:
661 can be fit into 2 0 times, resulting in 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.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 661

Advancing to step 2:
If we divide 21 by 661, we get 0 and a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 21 after subtracting 0 from 21.
Fetch the next digit (1) from the dividend, attach it to 21 and continue: 211 / 661

Let's proceed to step 3:
211 divided by 661 is 0 with a remainder of 211.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 211 after subtracting 0 from 211.
Include the next digit (0) from the dividend after 211, then repeat: 2110 / 661

Advancing to step 4:
The number 661 fits into 2110 3 times, leaving a remainder of 127.
Use 3 as the next digit of our solution. 
Result so far: 3.0
The remainder is 127 after subtracting 1983 from 2110.
Fetch the next digit (7) from the dividend, attach it to 127 and continue: 1277 / 661

Advancing to step 5:
The number 661 fits into 1277 1 times, leaving a remainder of 616.
Record the quotient 1 as the next digit in the result. 
Result so far: 31.0
Subtract 661 from 1277 to get 616.
Fetch the next digit (2) from the dividend, attach it to 616 and continue: 6162 / 661

Moving on to step 6:
661 goes into 6162 9 times with a remainder of 213.
Put 9 as the next digit of the answer. 
Result so far: 319.0
Subtracting 5949 from 6162 leaves us with 213.
Include the next digit (5) from the dividend after 213, then repeat: 2135 / 661

Going ahead to step 7:
2135 divided by 661 is 3 with a remainder of 152.
The next digit of our result is 3. 
Result so far: 3193.0
Deduct 1983 from 2135 and we're left with 152.
Append the next digit (2) from the dividend to 152 and continue with: 1522 / 661

Going ahead to step 8:
When dividing 1522 by 661, we get 2 with a remainder of 200.
Write down 2 as next digit of the result. 
Result so far: 31932.0
Subtract 1322 from 1522 to get 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Going ahead to step 9:
661 goes into 2000 3 times with a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 31932.3
If we take 1983 away from 2000, we end up with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Going ahead to step 10:
661 can be fit into 170 0 times, resulting in a remainder of 170.
Use 0 as the next digit of our solution. 
Result so far: 31932.3
Subtracting 0 from 170 leaves us with 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

Moving on to step 11:
When dividing 1700 by 661, we get 2 with a remainder of 378.
The next digit of our result is 2. 
Result so far: 31932.302
If we subtract 1322 from 1700, we get 378.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3780, and continue the process.

Step 12:
661 can be fit into 3780 5 times, resulting in a remainder of 475.
The number 5 becomes the next digit in our result. 
Result so far: 31932.3025
If we subtract 3305 from 3780, we get 475.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4750, and continue the process.

Advancing to step 13:
When dividing 4750 by 661, we get 7 with a remainder of 123.
The next digit of our result is 7. 
Result so far: 31932.30257
Deduct 4627 from 4750 and we're left with 123.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1230, and continue the process.

Going ahead to step 14:
661 can be fit into 1230 1 times, resulting in a remainder of 569.
Use 1 as the next digit of our solution. 
Result so far: 31932.302571
The remainder is 569 after subtracting 661 from 1230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5690, and continue the process.

Step 15:
661 goes into 5690 8 times with a remainder of 402.
Put 8 as the next digit of the answer. 
Result so far: 31932.3025718
If we take 5288 away from 5690, we end up with 402.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4020, and continue the process.

Advancing to step 16:
661 goes into 4020 6 times with a remainder of 54.
The number 6 becomes the next digit in our result. 
Result so far: 31932.30257186
Subtracting 3966 from 4020 leaves us with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Our division results in 31932.30257186 with a remaining 5.4e-08.