We divide 575073 by 87
The aim is to understand the frequency of 87 in 575073.

On to step 1:
The number 87 fits into 5 0 times, leaving a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Include the next digit (7) from the dividend after 5, then repeat: 57 / 87

Advancing to step 2:
87 goes into 57 0 times with a remainder of 57.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 57 and we're left with 57.
Fetch the next digit (5) from the dividend, attach it to 57 and continue: 575 / 87

On to step 3:
If we divide 575 by 87, we get 6 and a remainder of 53.
Put 6 as the next digit of the answer. 
Result so far: 6.0
If we subtract 522 from 575, we get 53.
Bring next digit (0) of the dividend behind the 53 and repeat the process: 530 / 87

On to step 4:
530 divided by 87 is 6 with a remainder of 8.
Record the quotient 6 as the next digit in the result. 
Result so far: 66.0
If we subtract 522 from 530, we get 8.
Take the next digit (7) from the dividend and append it to 8, then repeat: 87 / 87

Going ahead to step 5:
If we divide 87 by 87, we get 1 and a remainder of 0.
Use 1 as the next digit of our solution. 
Result so far: 661.0
The remainder is 0 after subtracting 87 from 87.
Fetch the next digit (3) from the dividend, attach it to 0 and continue: 3 / 87

Advancing to step 6:
3 divided by 87 is 0 with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 6610.0
Subtract 0 from 3 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 7:
30 divided by 87 is 0 with a remainder of 30.
Use 0 as the next digit of our solution. 
Result so far: 6610.0
Subtract 0 from 30 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 8:
When dividing 300 by 87, we get 3 with a remainder of 39.
Use 3 as the next digit of our solution. 
Result so far: 6610.03
If we take 261 away from 300, we end up with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Step 9:
If we divide 390 by 87, we get 4 and a remainder of 42.
Record the quotient 4 as the next digit in the result. 
Result so far: 6610.034
Deduct 348 from 390 and we're left with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Advancing to step 10:
If we divide 420 by 87, we get 4 and a remainder of 72.
The number 4 becomes the next digit in our result. 
Result so far: 6610.0344
Deduct 348 from 420 and we're left with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

The final outcome is 6610.0344, with a leftover of 0.00072.