Let's divide 31563361 by 661
The aim is to understand the frequency of 661 in 31563361.

Moving on to step 1:
The number 661 fits into 3 0 times, leaving a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Fetch the next digit (1) from the dividend, attach it to 3 and continue: 31 / 661

Step 2:
When dividing 31 by 661, we get 0 with a remainder of 31.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 31 leaves us with 31.
Grab the next digit (5) from the dividend, add it to 31, then carry on: 315 / 661

Step 3:
The number 661 fits into 315 0 times, leaving a remainder of 315.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 315 to get 315.
Fetch the next digit (6) from the dividend, attach it to 315 and continue: 3156 / 661

Advancing to step 4:
661 goes into 3156 4 times with a remainder of 512.
Use 4 as the next digit of our solution. 
Result so far: 4.0
Subtract 2644 from 3156 to get 512.
Append the next digit (3) from the dividend to 512 and continue with: 5123 / 661

Step 5:
5123 divided by 661 is 7 with a remainder of 496.
Use 7 as the next digit of our solution. 
Result so far: 47.0
Deduct 4627 from 5123 and we're left with 496.
Grab the next digit (3) from the dividend, add it to 496, then carry on: 4963 / 661

Moving on to step 6:
The number 661 fits into 4963 7 times, leaving a remainder of 336.
Write down 7 as next digit of the result. 
Result so far: 477.0
If we subtract 4627 from 4963, we get 336.
Grab the next digit (6) from the dividend, add it to 336, then carry on: 3366 / 661

Step 7:
3366 divided by 661 is 5 with a remainder of 61.
The number 5 becomes the next digit in our result. 
Result so far: 4775.0
Subtracting 3305 from 3366 leaves us with 61.
Append the next digit (1) from the dividend to 61 and continue with: 611 / 661

Moving on to step 8:
661 can be fit into 611 0 times, resulting in a remainder of 611.
Put 0 as the next digit of the answer. 
Result so far: 47750.0
The remainder is 611 after subtracting 0 from 611.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6110, and continue the process.

Step 9:
If we divide 6110 by 661, we get 9 and a remainder of 161.
Record the quotient 9 as the next digit in the result. 
Result so far: 47750.9
If we subtract 5949 from 6110, we get 161.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1610, and continue the process.

Let's proceed to step 10:
The number 661 fits into 1610 2 times, leaving a remainder of 288.
Write down 2 as next digit of the result. 
Result so far: 47750.92
The remainder is 288 after subtracting 1322 from 1610.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2880, and continue the process.

Advancing to step 11:
The number 661 fits into 2880 4 times, leaving a remainder of 236.
Use 4 as the next digit of our solution. 
Result so far: 47750.924
Subtract 2644 from 2880 to get 236.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2360, and continue the process.

Going ahead to step 12:
2360 divided by 661 is 3 with a remainder of 377.
The next digit of our result is 3. 
Result so far: 47750.9243
If we subtract 1983 from 2360, we get 377.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3770, and continue the process.

Moving on to step 13:
661 can be fit into 3770 5 times, resulting in a remainder of 465.
The number 5 becomes the next digit in our result. 
Result so far: 47750.92435
If we subtract 3305 from 3770, we get 465.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4650, and continue the process.

Advancing to step 14:
4650 divided by 661 is 7 with a remainder of 23.
Put 7 as the next digit of the answer. 
Result so far: 47750.924357
The remainder is 23 after subtracting 4627 from 4650.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Moving on to step 15:
If we divide 230 by 661, we get 0 and a remainder of 230.
Record the quotient 0 as the next digit in the result. 
Result so far: 47750.924357
Deduct 0 from 230 and we're left with 230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2300, and continue the process.

Going ahead to step 16:
When dividing 2300 by 661, we get 3 with a remainder of 317.
Use 3 as the next digit of our solution. 
Result so far: 47750.92435703
The remainder is 317 after subtracting 1983 from 2300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3170, and continue the process.

The quotient of the division is 47750.92435703, and the remainder is 3.17e-07.