87130621 ÷ 545 
The aim is to understand the frequency of 545 in 87130621.

On to step 1:
When dividing 8 by 545, we get 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Append the next digit (7) from the dividend to 8 and continue with: 87 / 545

Advancing to step 2:
87 divided by 545 is 0 with a remainder of 87.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 87, we end up with 87.
Bring next digit (1) of the dividend behind the 87 and repeat the process: 871 / 545

On to step 3:
The number 545 fits into 871 1 times, leaving a remainder of 326.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtract 545 from 871 to get 326.
Fetch the next digit (3) from the dividend, attach it to 326 and continue: 3263 / 545

Step 4:
If we divide 3263 by 545, we get 5 and a remainder of 538.
The next digit of our result is 5. 
Result so far: 15.0
If we subtract 2725 from 3263, we get 538.
Fetch the next digit (0) from the dividend, attach it to 538 and continue: 5380 / 545

Step 5:
The number 545 fits into 5380 9 times, leaving a remainder of 475.
The number 9 becomes the next digit in our result. 
Result so far: 159.0
Subtracting 4905 from 5380 leaves us with 475.
Grab the next digit (6) from the dividend, add it to 475, then carry on: 4756 / 545

Going ahead to step 6:
545 goes into 4756 8 times with a remainder of 396.
Put 8 as the next digit of the answer. 
Result so far: 1598.0
Subtracting 4360 from 4756 leaves us with 396.
Fetch the next digit (2) from the dividend, attach it to 396 and continue: 3962 / 545

Let's proceed to step 7:
3962 divided by 545 is 7 with a remainder of 147.
The next digit of our result is 7. 
Result so far: 15987.0
If we take 3815 away from 3962, we end up with 147.
Append the next digit (1) from the dividend to 147 and continue with: 1471 / 545

Advancing to step 8:
1471 divided by 545 is 2 with a remainder of 381.
The next digit of our result is 2. 
Result so far: 159872.0
Deduct 1090 from 1471 and we're left with 381.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3810, and continue the process.

Let's proceed to step 9:
If we divide 3810 by 545, we get 6 and a remainder of 540.
The number 6 becomes the next digit in our result. 
Result so far: 159872.6
If we take 3270 away from 3810, we end up with 540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5400, and continue the process.

Step 10:
If we divide 5400 by 545, we get 9 and a remainder of 495.
Use 9 as the next digit of our solution. 
Result so far: 159872.69
If we take 4905 away from 5400, we end up with 495.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4950, and continue the process.

On to step 11:
4950 divided by 545 is 9 with a remainder of 45.
The number 9 becomes the next digit in our result. 
Result so far: 159872.699
Subtract 4905 from 4950 to 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.

In conclusion, the division gives 159872.699 with a balance of 0.0045.