15021287 divided by 217 
The aim is to understand the frequency of 217 in 15021287.

Advancing to step 1:
217 can be fit into 1 0 times, resulting in a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Include the next digit (5) from the dividend after 1, then repeat: 15 / 217

Step 2:
The number 217 fits into 15 0 times, leaving a remainder of 15.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 15 and we're left with 15.
Append the next digit (0) from the dividend to 15 and continue with: 150 / 217

Step 3:
When dividing 150 by 217, we get 0 with a remainder of 150.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 150 to get 150.
Bring next digit (2) of the dividend behind the 150 and repeat the process: 1502 / 217

On to step 4:
217 goes into 1502 6 times with a remainder of 200.
Use 6 as the next digit of our solution. 
Result so far: 6.0
The remainder is 200 after subtracting 1302 from 1502.
Bring next digit (1) of the dividend behind the 200 and repeat the process: 2001 / 217

Let's proceed to step 5:
If we divide 2001 by 217, we get 9 and a remainder of 48.
Write down 9 as next digit of the result. 
Result so far: 69.0
Subtracting 1953 from 2001 leaves us with 48.
Append the next digit (2) from the dividend to 48 and continue with: 482 / 217

Advancing to step 6:
217 can be fit into 482 2 times, resulting in a remainder of 48.
Write down 2 as next digit of the result. 
Result so far: 692.0
Subtract 434 from 482 to get 48.
Take the next digit (8) from the dividend and append it to 48, then repeat: 488 / 217

On to step 7:
The number 217 fits into 488 2 times, leaving a remainder of 54.
Put 2 as the next digit of the answer. 
Result so far: 6922.0
Deduct 434 from 488 and we're left with 54.
Append the next digit (7) from the dividend to 54 and continue with: 547 / 217

On to step 8:
217 can be fit into 547 2 times, resulting in a remainder of 113.
Put 2 as the next digit of the answer. 
Result so far: 69222.0
Subtracting 434 from 547 leaves us with 113.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1130, and continue the process.

Advancing to step 9:
If we divide 1130 by 217, we get 5 and a remainder of 45.
Write down 5 as next digit of the result. 
Result so far: 69222.5
If we subtract 1085 from 1130, we get 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Moving on to step 10:
217 can be fit into 450 2 times, resulting in a remainder of 16.
Put 2 as the next digit of the answer. 
Result so far: 69222.52
If we take 434 away from 450, we end up with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Advancing to step 11:
217 can be fit into 160 0 times, resulting in a remainder of 160.
Write down 0 as next digit of the result. 
Result so far: 69222.52
If we take 0 away from 160, we end up with 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

On to step 12:
If we divide 1600 by 217, we get 7 and a remainder of 81.
The number 7 becomes the next digit in our result. 
Result so far: 69222.5207
Subtracting 1519 from 1600 leaves us with 81.
Since there are no more digits in the dividend, we add a zero to the remainder making it 810, and continue the process.

Moving on to step 13:
If we divide 810 by 217, we get 3 and a remainder of 159.
Put 3 as the next digit of the answer. 
Result so far: 69222.52073
If we take 651 away from 810, we end up with 159.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1590, and continue the process.

Advancing to step 14:
1590 divided by 217 is 7 with a remainder of 71.
Write down 7 as next digit of the result. 
Result so far: 69222.520737
The remainder is 71 after subtracting 1519 from 1590.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

On to step 15:
217 goes into 710 3 times with a remainder of 59.
The next digit of our result is 3. 
Result so far: 69222.5207373
Subtract 651 from 710 to get 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Advancing to step 16:
217 goes into 590 2 times with a remainder of 156.
Record the quotient 2 as the next digit in the result. 
Result so far: 69222.52073732
If we take 434 away from 590, we end up with 156.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1560, and continue the process.

After the division, we end up with 69222.52073732 and a remainder of 1.56e-07.