87215667 divided by 286 
The aim is to understand the frequency of 286 in 87215667.

On to step 1:
When dividing 8 by 286, we get 0 with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Append the next digit (7) from the dividend to 8 and continue with: 87 / 286

Going ahead to step 2:
The number 286 fits into 87 0 times, leaving a remainder of 87.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 87 leaves us with 87.
Include the next digit (2) from the dividend after 87, then repeat: 872 / 286

On to step 3:
If we divide 872 by 286, we get 3 and a remainder of 14.
Use 3 as the next digit of our solution. 
Result so far: 3.0
If we take 858 away from 872, we end up with 14.
Append the next digit (1) from the dividend to 14 and continue with: 141 / 286

Step 4:
The number 286 fits into 141 0 times, leaving a remainder of 141.
Record the quotient 0 as the next digit in the result. 
Result so far: 30.0
If we take 0 away from 141, we end up with 141.
Fetch the next digit (5) from the dividend, attach it to 141 and continue: 1415 / 286

Moving on to step 5:
1415 divided by 286 is 4 with a remainder of 271.
Put 4 as the next digit of the answer. 
Result so far: 304.0
If we take 1144 away from 1415, we end up with 271.
Fetch the next digit (6) from the dividend, attach it to 271 and continue: 2716 / 286

Advancing to step 6:
The number 286 fits into 2716 9 times, leaving a remainder of 142.
Use 9 as the next digit of our solution. 
Result so far: 3049.0
If we subtract 2574 from 2716, we get 142.
Take the next digit (6) from the dividend and append it to 142, then repeat: 1426 / 286

Step 7:
When dividing 1426 by 286, we get 4 with a remainder of 282.
Put 4 as the next digit of the answer. 
Result so far: 30494.0
Subtract 1144 from 1426 to get 282.
Grab the next digit (7) from the dividend, add it to 282, then carry on: 2827 / 286

Moving on to step 8:
When dividing 2827 by 286, we get 9 with a remainder of 253.
Record the quotient 9 as the next digit in the result. 
Result so far: 304949.0
Subtracting 2574 from 2827 leaves us with 253.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2530, and continue the process.

On to step 9:
When dividing 2530 by 286, we get 8 with a remainder of 242.
The next digit of our result is 8. 
Result so far: 304949.8
Subtract 2288 from 2530 to get 242.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2420, and continue the process.

Moving on to step 10:
The number 286 fits into 2420 8 times, leaving a remainder of 132.
Write down 8 as next digit of the result. 
Result so far: 304949.88
Subtracting 2288 from 2420 leaves us with 132.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1320, and continue the process.

After the division, we end up with 304949.88 and a remainder of 0.132.