We're dividing 15633631 by 872 
The aim is to understand the frequency of 872 in 15633631.

Step 1:
The number 872 fits into 1 0 times, leaving a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Fetch the next digit (5) from the dividend, attach it to 1 and continue: 15 / 872

Let's proceed to step 2:
872 goes into 15 0 times with a remainder of 15.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 15 and we're left with 15.
Append the next digit (6) from the dividend to 15 and continue with: 156 / 872

Moving on to step 3:
If we divide 156 by 872, we get 0 and a remainder of 156.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 156 after subtracting 0 from 156.
Append the next digit (3) from the dividend to 156 and continue with: 1563 / 872

Let's proceed to step 4:
872 goes into 1563 1 times with a remainder of 691.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we subtract 872 from 1563, we get 691.
Append the next digit (3) from the dividend to 691 and continue with: 6913 / 872

Going ahead to step 5:
872 goes into 6913 7 times with a remainder of 809.
Record the quotient 7 as the next digit in the result. 
Result so far: 17.0
If we subtract 6104 from 6913, we get 809.
Bring next digit (6) of the dividend behind the 809 and repeat the process: 8096 / 872

Advancing to step 6:
8096 divided by 872 is 9 with a remainder of 248.
The next digit of our result is 9. 
Result so far: 179.0
If we take 7848 away from 8096, we end up with 248.
Fetch the next digit (3) from the dividend, attach it to 248 and continue: 2483 / 872

Advancing to step 7:
The number 872 fits into 2483 2 times, leaving a remainder of 739.
Record the quotient 2 as the next digit in the result. 
Result so far: 1792.0
If we take 1744 away from 2483, we end up with 739.
Take the next digit (1) from the dividend and append it to 739, then repeat: 7391 / 872

Going ahead to step 8:
872 goes into 7391 8 times with a remainder of 415.
Record the quotient 8 as the next digit in the result. 
Result so far: 17928.0
Subtract 6976 from 7391 to get 415.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4150, and continue the process.

Let's proceed to step 9:
872 goes into 4150 4 times with a remainder of 662.
Write down 4 as next digit of the result. 
Result so far: 17928.4
If we subtract 3488 from 4150, we get 662.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6620, and continue the process.

Moving on to step 10:
The number 872 fits into 6620 7 times, leaving a remainder of 516.
Use 7 as the next digit of our solution. 
Result so far: 17928.47
If we subtract 6104 from 6620, we get 516.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5160, and continue the process.

Moving on to step 11:
872 goes into 5160 5 times with a remainder of 800.
The number 5 becomes the next digit in our result. 
Result so far: 17928.475
The remainder is 800 after subtracting 4360 from 5160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8000, and continue the process.

Going ahead to step 12:
872 can be fit into 8000 9 times, resulting in a remainder of 152.
The next digit of our result is 9. 
Result so far: 17928.4759
Deduct 7848 from 8000 and we're left with 152.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1520, and continue the process.

Moving on to step 13:
When dividing 1520 by 872, we get 1 with a remainder of 648.
Record the quotient 1 as the next digit in the result. 
Result so far: 17928.47591
If we subtract 872 from 1520, we get 648.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6480, and continue the process.

Going ahead to step 14:
6480 divided by 872 is 7 with a remainder of 376.
Record the quotient 7 as the next digit in the result. 
Result so far: 17928.475917
If we subtract 6104 from 6480, we get 376.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3760, and continue the process.

Moving on to step 15:
When dividing 3760 by 872, we get 4 with a remainder of 272.
Put 4 as the next digit of the answer. 
Result so far: 17928.4759174
Subtract 3488 from 3760 to get 272.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2720, and continue the process.

Going ahead to step 16:
When dividing 2720 by 872, we get 3 with a remainder of 104.
Put 3 as the next digit of the answer. 
Result so far: 17928.47591743
Subtract 2616 from 2720 to get 104.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1040, and continue the process.

The final result is 17928.47591743 with a remainder of 1.04e-07.