We look at the division of 25831429 by 994 
The aim is to understand the frequency of 994 in 25831429.

Advancing to step 1:
2 divided by 994 is 0 with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Bring next digit (5) of the dividend behind the 2 and repeat the process: 25 / 994

Going ahead to step 2:
994 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
The remainder is 25 after subtracting 0 from 25.
Append the next digit (8) from the dividend to 25 and continue with: 258 / 994

On to step 3:
994 can be fit into 258 0 times, resulting in a remainder of 258.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 258 and we're left with 258.
Include the next digit (3) from the dividend after 258, then repeat: 2583 / 994

Let's proceed to step 4:
2583 divided by 994 is 2 with a remainder of 595.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Deduct 1988 from 2583 and we're left with 595.
Append the next digit (1) from the dividend to 595 and continue with: 5951 / 994

Advancing to step 5:
If we divide 5951 by 994, we get 5 and a remainder of 981.
Write down 5 as next digit of the result. 
Result so far: 25.0
Deduct 4970 from 5951 and we're left with 981.
Grab the next digit (4) from the dividend, add it to 981, then carry on: 9814 / 994

Moving on to step 6:
994 goes into 9814 9 times with a remainder of 868.
Put 9 as the next digit of the answer. 
Result so far: 259.0
If we subtract 8946 from 9814, we get 868.
Fetch the next digit (2) from the dividend, attach it to 868 and continue: 8682 / 994

Advancing to step 7:
If we divide 8682 by 994, we get 8 and a remainder of 730.
Put 8 as the next digit of the answer. 
Result so far: 2598.0
If we take 7952 away from 8682, we end up with 730.
Bring next digit (9) of the dividend behind the 730 and repeat the process: 7309 / 994

Moving on to step 8:
The number 994 fits into 7309 7 times, leaving a remainder of 351.
Use 7 as the next digit of our solution. 
Result so far: 25987.0
Subtract 6958 from 7309 to get 351.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3510, and continue the process.

Moving on to step 9:
When dividing 3510 by 994, we get 3 with a remainder of 528.
The number 3 becomes the next digit in our result. 
Result so far: 25987.3
Deduct 2982 from 3510 and we're left with 528.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5280, and continue the process.

Advancing to step 10:
The number 994 fits into 5280 5 times, leaving a remainder of 310.
The next digit of our result is 5. 
Result so far: 25987.35
If we subtract 4970 from 5280, we get 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3100, and continue the process.

Going ahead to step 11:
994 can be fit into 3100 3 times, resulting in a remainder of 118.
The next digit of our result is 3. 
Result so far: 25987.353
Deduct 2982 from 3100 and we're left with 118.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1180, and continue the process.

Going ahead to step 12:
If we divide 1180 by 994, we get 1 and a remainder of 186.
Put 1 as the next digit of the answer. 
Result so far: 25987.3531
The remainder is 186 after subtracting 994 from 1180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1860, and continue the process.

On to step 13:
994 goes into 1860 1 times with a remainder of 866.
Put 1 as the next digit of the answer. 
Result so far: 25987.35311
Subtract 994 from 1860 to get 866.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8660, and continue the process.

The final outcome is 25987.35311, with a leftover of 0.000866.