We look at the division of 25704783 by 861 
The aim is to understand the frequency of 861 in 25704783.

On to step 1:
2 divided by 861 is 0 with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Grab the next digit (5) from the dividend, add it to 2, then carry on: 25 / 861

Advancing to step 2:
861 goes into 25 0 times with a remainder of 25.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 25, we get 25.
Fetch the next digit (7) from the dividend, attach it to 25 and continue: 257 / 861

Step 3:
257 divided by 861 is 0 with a remainder of 257.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 257, we get 257.
Take the next digit (0) from the dividend and append it to 257, then repeat: 2570 / 861

On to step 4:
2570 divided by 861 is 2 with a remainder of 848.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Deduct 1722 from 2570 and we're left with 848.
Take the next digit (4) from the dividend and append it to 848, then repeat: 8484 / 861

Step 5:
If we divide 8484 by 861, we get 9 and a remainder of 735.
Write down 9 as next digit of the result. 
Result so far: 29.0
If we take 7749 away from 8484, we end up with 735.
Bring next digit (7) of the dividend behind the 735 and repeat the process: 7357 / 861

Advancing to step 6:
861 goes into 7357 8 times with a remainder of 469.
Put 8 as the next digit of the answer. 
Result so far: 298.0
Subtract 6888 from 7357 to get 469.
Append the next digit (8) from the dividend to 469 and continue with: 4698 / 861

On to step 7:
861 goes into 4698 5 times with a remainder of 393.
Record the quotient 5 as the next digit in the result. 
Result so far: 2985.0
If we take 4305 away from 4698, we end up with 393.
Include the next digit (3) from the dividend after 393, then repeat: 3933 / 861

Moving on to step 8:
The number 861 fits into 3933 4 times, leaving a remainder of 489.
The number 4 becomes the next digit in our result. 
Result so far: 29854.0
Subtract 3444 from 3933 to get 489.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4890, and continue the process.

Going ahead to step 9:
861 goes into 4890 5 times with a remainder of 585.
Use 5 as the next digit of our solution. 
Result so far: 29854.5
Subtracting 4305 from 4890 leaves us with 585.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5850, and continue the process.

Going ahead to step 10:
When dividing 5850 by 861, we get 6 with a remainder of 684.
The next digit of our result is 6. 
Result so far: 29854.56
If we take 5166 away from 5850, we end up with 684.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6840, and continue the process.

Going ahead to step 11:
861 can be fit into 6840 7 times, resulting in a remainder of 813.
Put 7 as the next digit of the answer. 
Result so far: 29854.567
Subtracting 6027 from 6840 leaves us with 813.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8130, and continue the process.

Let's proceed to step 12:
861 goes into 8130 9 times with a remainder of 381.
Put 9 as the next digit of the answer. 
Result so far: 29854.5679
If we subtract 7749 from 8130, we get 381.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3810, and continue the process.

Advancing to step 13:
If we divide 3810 by 861, we get 4 and a remainder of 366.
The next digit of our result is 4. 
Result so far: 29854.56794
Deduct 3444 from 3810 and we're left with 366.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3660, and continue the process.

Moving on to step 14:
3660 divided by 861 is 4 with a remainder of 216.
Put 4 as the next digit of the answer. 
Result so far: 29854.567944
If we subtract 3444 from 3660, we get 216.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2160, and continue the process.

The quotient of the division is 29854.567944, and the remainder is 2.16e-05.