We look at the division of 17939656 by 870 
The aim is to understand the frequency of 870 in 17939656.

Advancing to step 1:
When dividing 1 by 870, we get 0 with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Bring next digit (7) of the dividend behind the 1 and repeat the process: 17 / 870

Moving on to step 2:
17 divided by 870 is 0 with a remainder of 17.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 17 to get 17.
Append the next digit (9) from the dividend to 17 and continue with: 179 / 870

On to step 3:
When dividing 179 by 870, we get 0 with a remainder of 179.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 179, we end up with 179.
Fetch the next digit (3) from the dividend, attach it to 179 and continue: 1793 / 870

Advancing to step 4:
870 can be fit into 1793 2 times, resulting in a remainder of 53.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Subtracting 1740 from 1793 leaves us with 53.
Fetch the next digit (9) from the dividend, attach it to 53 and continue: 539 / 870

Going ahead to step 5:
The number 870 fits into 539 0 times, leaving a remainder of 539.
The next digit of our result is 0. 
Result so far: 20.0
Subtract 0 from 539 to get 539.
Append the next digit (6) from the dividend to 539 and continue with: 5396 / 870

On to step 6:
When dividing 5396 by 870, we get 6 with a remainder of 176.
Write down 6 as next digit of the result. 
Result so far: 206.0
If we subtract 5220 from 5396, we get 176.
Append the next digit (5) from the dividend to 176 and continue with: 1765 / 870

Moving on to step 7:
1765 divided by 870 is 2 with a remainder of 25.
Put 2 as the next digit of the answer. 
Result so far: 2062.0
Subtracting 1740 from 1765 leaves us with 25.
Take the next digit (6) from the dividend and append it to 25, then repeat: 256 / 870

Step 8:
If we divide 256 by 870, we get 0 and a remainder of 256.
Write down 0 as next digit of the result. 
Result so far: 20620.0
Subtracting 0 from 256 leaves us with 256.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2560, and continue the process.

Going ahead to step 9:
If we divide 2560 by 870, we get 2 and a remainder of 820.
The number 2 becomes the next digit in our result. 
Result so far: 20620.2
If we take 1740 away from 2560, we end up with 820.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8200, and continue the process.

Moving on to step 10:
When dividing 8200 by 870, we get 9 with a remainder of 370.
Record the quotient 9 as the next digit in the result. 
Result so far: 20620.29
The remainder is 370 after subtracting 7830 from 8200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3700, and continue the process.

Let's proceed to step 11:
The number 870 fits into 3700 4 times, leaving a remainder of 220.
Record the quotient 4 as the next digit in the result. 
Result so far: 20620.294
Deduct 3480 from 3700 and we're left with 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

Advancing to step 12:
870 goes into 2200 2 times with a remainder of 460.
Write down 2 as next digit of the result. 
Result so far: 20620.2942
Deduct 1740 from 2200 and we're left with 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4600, and continue the process.

Step 13:
If we divide 4600 by 870, we get 5 and a remainder of 250.
Record the quotient 5 as the next digit in the result. 
Result so far: 20620.29425
Subtracting 4350 from 4600 leaves us with 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2500, and continue the process.

On to step 14:
The number 870 fits into 2500 2 times, leaving a remainder of 760.
Write down 2 as next digit of the result. 
Result so far: 20620.294252
Deduct 1740 from 2500 and we're left with 760.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7600, and continue the process.

On to step 15:
870 goes into 7600 8 times with a remainder of 640.
The next digit of our result is 8. 
Result so far: 20620.2942528
Deduct 6960 from 7600 and we're left with 640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6400, and continue the process.

Moving on to step 16:
The number 870 fits into 6400 7 times, leaving a remainder of 310.
Record the quotient 7 as the next digit in the result. 
Result so far: 20620.29425287
Subtracting 6090 from 6400 leaves us with 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3100, and continue the process.

The final result is 20620.29425287 with a remainder of 3.1e-07.