We're dividing 25296891 by 861 
The aim is to understand the frequency of 861 in 25296891.

Moving on to step 1:
When dividing 2 by 861, we get 0 with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Take the next digit (5) from the dividend and append it to 2, then repeat: 25 / 861

Step 2:
25 divided by 861 is 0 with a remainder of 25.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 25 after subtracting 0 from 25.
Take the next digit (2) from the dividend and append it to 25, then repeat: 252 / 861

Going ahead to step 3:
The number 861 fits into 252 0 times, leaving a remainder of 252.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 252 leaves us with 252.
Take the next digit (9) from the dividend and append it to 252, then repeat: 2529 / 861

On to step 4:
When dividing 2529 by 861, we get 2 with a remainder of 807.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Deduct 1722 from 2529 and we're left with 807.
Include the next digit (6) from the dividend after 807, then repeat: 8076 / 861

Step 5:
If we divide 8076 by 861, we get 9 and a remainder of 327.
The next digit of our result is 9. 
Result so far: 29.0
Subtract 7749 from 8076 to get 327.
Include the next digit (8) from the dividend after 327, then repeat: 3278 / 861

Moving on to step 6:
861 goes into 3278 3 times with a remainder of 695.
Write down 3 as next digit of the result. 
Result so far: 293.0
Deduct 2583 from 3278 and we're left with 695.
Append the next digit (9) from the dividend to 695 and continue with: 6959 / 861

Going ahead to step 7:
If we divide 6959 by 861, we get 8 and a remainder of 71.
The number 8 becomes the next digit in our result. 
Result so far: 2938.0
Subtracting 6888 from 6959 leaves us with 71.
Take the next digit (1) from the dividend and append it to 71, then repeat: 711 / 861

Let's proceed to step 8:
711 divided by 861 is 0 with a remainder of 711.
Put 0 as the next digit of the answer. 
Result so far: 29380.0
Subtract 0 from 711 to get 711.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7110, and continue the process.

Step 9:
The number 861 fits into 7110 8 times, leaving a remainder of 222.
The number 8 becomes the next digit in our result. 
Result so far: 29380.8
Subtracting 6888 from 7110 leaves us with 222.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2220, and continue the process.

Let's proceed to step 10:
861 can be fit into 2220 2 times, resulting in a remainder of 498.
The next digit of our result is 2. 
Result so far: 29380.82
Subtracting 1722 from 2220 leaves us with 498.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4980, and continue the process.

Moving on to step 11:
861 can be fit into 4980 5 times, resulting in a remainder of 675.
The next digit of our result is 5. 
Result so far: 29380.825
If we subtract 4305 from 4980, we get 675.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6750, and continue the process.

Let's proceed to step 12:
When dividing 6750 by 861, we get 7 with a remainder of 723.
Use 7 as the next digit of our solution. 
Result so far: 29380.8257
Subtract 6027 from 6750 to get 723.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7230, and continue the process.

Advancing to step 13:
The number 861 fits into 7230 8 times, leaving a remainder of 342.
Put 8 as the next digit of the answer. 
Result so far: 29380.82578
If we take 6888 away from 7230, we end up with 342.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3420, and continue the process.

Going ahead to step 14:
The number 861 fits into 3420 3 times, leaving a remainder of 837.
Use 3 as the next digit of our solution. 
Result so far: 29380.825783
Subtract 2583 from 3420 to get 837.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8370, and continue the process.

On to step 15:
The number 861 fits into 8370 9 times, leaving a remainder of 621.
The next digit of our result is 9. 
Result so far: 29380.8257839
The remainder is 621 after subtracting 7749 from 8370.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6210, and continue the process.

Going ahead to step 16:
861 can be fit into 6210 7 times, resulting in a remainder of 183.
The next digit of our result is 7. 
Result so far: 29380.82578397
Subtract 6027 from 6210 to get 183.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1830, and continue the process.

The final outcome is 29380.82578397, with a leftover of 1.83e-07.