25800978 ÷ 849 
The aim is to understand the frequency of 849 in 25800978.

Moving on to step 1:
When dividing 2 by 849, we get 0 with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Fetch the next digit (5) from the dividend, attach it to 2 and continue: 25 / 849

Going ahead to step 2:
849 can be fit into 25 0 times, resulting in a remainder of 25.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 25 to get 25.
Append the next digit (8) from the dividend to 25 and continue with: 258 / 849

On to step 3:
If we divide 258 by 849, we get 0 and a remainder of 258.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 258 and we're left with 258.
Fetch the next digit (0) from the dividend, attach it to 258 and continue: 2580 / 849

On to step 4:
849 can be fit into 2580 3 times, resulting in a remainder of 33.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Subtracting 2547 from 2580 leaves us with 33.
Append the next digit (0) from the dividend to 33 and continue with: 330 / 849

Moving on to step 5:
849 goes into 330 0 times with a remainder of 330.
Record the quotient 0 as the next digit in the result. 
Result so far: 30.0
Subtracting 0 from 330 leaves us with 330.
Take the next digit (9) from the dividend and append it to 330, then repeat: 3309 / 849

Step 6:
3309 divided by 849 is 3 with a remainder of 762.
The next digit of our result is 3. 
Result so far: 303.0
Subtracting 2547 from 3309 leaves us with 762.
Grab the next digit (7) from the dividend, add it to 762, then carry on: 7627 / 849

On to step 7:
When dividing 7627 by 849, we get 8 with a remainder of 835.
Put 8 as the next digit of the answer. 
Result so far: 3038.0
Subtract 6792 from 7627 to get 835.
Grab the next digit (8) from the dividend, add it to 835, then carry on: 8358 / 849

Step 8:
If we divide 8358 by 849, we get 9 and a remainder of 717.
Use 9 as the next digit of our solution. 
Result so far: 30389.0
Deduct 7641 from 8358 and we're left with 717.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7170, and continue the process.

Advancing to step 9:
When dividing 7170 by 849, we get 8 with a remainder of 378.
The next digit of our result is 8. 
Result so far: 30389.8
Deduct 6792 from 7170 and we're left with 378.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3780, and continue the process.

Let's proceed to step 10:
The number 849 fits into 3780 4 times, leaving a remainder of 384.
The number 4 becomes the next digit in our result. 
Result so far: 30389.84
Subtract 3396 from 3780 to get 384.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3840, and continue the process.

Advancing to step 11:
849 goes into 3840 4 times with a remainder of 444.
The number 4 becomes the next digit in our result. 
Result so far: 30389.844
If we take 3396 away from 3840, we end up with 444.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4440, and continue the process.

The final outcome is 30389.844, with a leftover of 0.0444.