We look at the division of 27990754 by 870 
The aim is to understand the frequency of 870 in 27990754.

Let's proceed to step 1:
870 can be fit into 2 0 times, resulting in a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Fetch the next digit (7) from the dividend, attach it to 2 and continue: 27 / 870

Moving on to step 2:
When dividing 27 by 870, we get 0 with a remainder of 27.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 27 and we're left with 27.
Include the next digit (9) from the dividend after 27, then repeat: 279 / 870

Moving on to step 3:
When dividing 279 by 870, we get 0 with a remainder of 279.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 279 after subtracting 0 from 279.
Bring next digit (9) of the dividend behind the 279 and repeat the process: 2799 / 870

Moving on to step 4:
870 can be fit into 2799 3 times, resulting in a remainder of 189.
Use 3 as the next digit of our solution. 
Result so far: 3.0
If we subtract 2610 from 2799, we get 189.
Append the next digit (0) from the dividend to 189 and continue with: 1890 / 870

Going ahead to step 5:
1890 divided by 870 is 2 with a remainder of 150.
Write down 2 as next digit of the result. 
Result so far: 32.0
Subtracting 1740 from 1890 leaves us with 150.
Grab the next digit (7) from the dividend, add it to 150, then carry on: 1507 / 870

Step 6:
870 goes into 1507 1 times with a remainder of 637.
The next digit of our result is 1. 
Result so far: 321.0
If we subtract 870 from 1507, we get 637.
Include the next digit (5) from the dividend after 637, then repeat: 6375 / 870

Advancing to step 7:
The number 870 fits into 6375 7 times, leaving a remainder of 285.
Write down 7 as next digit of the result. 
Result so far: 3217.0
Subtract 6090 from 6375 to get 285.
Append the next digit (4) from the dividend to 285 and continue with: 2854 / 870

Going ahead to step 8:
870 goes into 2854 3 times with a remainder of 244.
The number 3 becomes the next digit in our result. 
Result so far: 32173.0
Subtracting 2610 from 2854 leaves us with 244.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2440, and continue the process.

On to step 9:
If we divide 2440 by 870, we get 2 and a remainder of 700.
The number 2 becomes the next digit in our result. 
Result so far: 32173.2
Deduct 1740 from 2440 and we're left with 700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7000, and continue the process.

Step 10:
When dividing 7000 by 870, we get 8 with a remainder of 40.
Record the quotient 8 as the next digit in the result. 
Result so far: 32173.28
The remainder is 40 after subtracting 6960 from 7000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 11:
If we divide 400 by 870, we get 0 and a remainder of 400.
Use 0 as the next digit of our solution. 
Result so far: 32173.28
Subtract 0 from 400 to get 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Moving on to step 12:
When dividing 4000 by 870, we get 4 with a remainder of 520.
Record the quotient 4 as the next digit in the result. 
Result so far: 32173.2804
The remainder is 520 after subtracting 3480 from 4000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5200, and continue the process.

Going ahead to step 13:
If we divide 5200 by 870, we get 5 and a remainder of 850.
Write down 5 as next digit of the result. 
Result so far: 32173.28045
The remainder is 850 after subtracting 4350 from 5200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8500, and continue the process.

On to step 14:
When dividing 8500 by 870, we get 9 with a remainder of 670.
The next digit of our result is 9. 
Result so far: 32173.280459
Subtract 7830 from 8500 to get 670.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6700, and continue the process.

Step 15:
6700 divided by 870 is 7 with a remainder of 610.
The number 7 becomes the next digit in our result. 
Result so far: 32173.2804597
If we subtract 6090 from 6700, we get 610.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6100, and continue the process.

Moving on to step 16:
6100 divided by 870 is 7 with a remainder of 10.
Use 7 as the next digit of our solution. 
Result so far: 32173.28045977
If we subtract 6090 from 6100, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final outcome is 32173.28045977, with a leftover of 1e-08.