357889 ÷ 87 
The aim is to understand the frequency of 87 in 357889.

Step 1:
The number 87 fits into 3 0 times, leaving a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Append the next digit (5) from the dividend to 3 and continue with: 35 / 87

Advancing to step 2:
If we divide 35 by 87, we get 0 and a remainder of 35.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 35 leaves us with 35.
Grab the next digit (7) from the dividend, add it to 35, then carry on: 357 / 87

On to step 3:
87 goes into 357 4 times with a remainder of 9.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
Subtracting 348 from 357 leaves us with 9.
Include the next digit (8) from the dividend after 9, then repeat: 98 / 87

Step 4:
87 goes into 98 1 times with a remainder of 11.
The number 1 becomes the next digit in our result. 
Result so far: 41.0
Subtracting 87 from 98 leaves us with 11.
Take the next digit (8) from the dividend and append it to 11, then repeat: 118 / 87

On to step 5:
The number 87 fits into 118 1 times, leaving a remainder of 31.
Use 1 as the next digit of our solution. 
Result so far: 411.0
If we subtract 87 from 118, we get 31.
Take the next digit (9) from the dividend and append it to 31, then repeat: 319 / 87

Advancing to step 6:
87 goes into 319 3 times with a remainder of 58.
The number 3 becomes the next digit in our result. 
Result so far: 4113.0
Subtract 261 from 319 to get 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Let's proceed to step 7:
If we divide 580 by 87, we get 6 and a remainder of 58.
Use 6 as the next digit of our solution. 
Result so far: 4113.6
Subtracting 522 from 580 leaves us with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Advancing to step 8:
When dividing 580 by 87, we get 6 with a remainder of 58.
Use 6 as the next digit of our solution. 
Result so far: 4113.66
Subtracting 522 from 580 leaves us with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

The final result is 4113.66 with a remainder of 0.058.