We're dividing 363879 by 25 
The aim is to understand the frequency of 25 in 363879.

Going ahead to step 1:
3 divided by 25 is 0 with a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Bring next digit (6) of the dividend behind the 3 and repeat the process: 36 / 25

Step 2:
25 can be fit into 36 1 times, resulting in a remainder of 11.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 25 from 36 to get 11.
Take the next digit (3) from the dividend and append it to 11, then repeat: 113 / 25

Step 3:
When dividing 113 by 25, we get 4 with a remainder of 13.
The number 4 becomes the next digit in our result. 
Result so far: 14.0
Subtract 100 from 113 to get 13.
Take the next digit (8) from the dividend and append it to 13, then repeat: 138 / 25

On to step 4:
If we divide 138 by 25, we get 5 and a remainder of 13.
The number 5 becomes the next digit in our result. 
Result so far: 145.0
Deduct 125 from 138 and we're left with 13.
Grab the next digit (7) from the dividend, add it to 13, then carry on: 137 / 25

Step 5:
If we divide 137 by 25, we get 5 and a remainder of 12.
Record the quotient 5 as the next digit in the result. 
Result so far: 1455.0
If we take 125 away from 137, we end up with 12.
Bring next digit (9) of the dividend behind the 12 and repeat the process: 129 / 25

On to step 6:
129 divided by 25 is 5 with a remainder of 4.
Record the quotient 5 as the next digit in the result. 
Result so far: 14555.0
The remainder is 4 after subtracting 125 from 129.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 7:
If we divide 40 by 25, we get 1 and a remainder of 15.
The number 1 becomes the next digit in our result. 
Result so far: 14555.1
If we subtract 25 from 40, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 8:
150 divided by 25 is 6 with a remainder of 0.
Put 6 as the next digit of the answer. 
Result so far: 14555.16
Subtracting 150 from 150 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 9:
When dividing 0 by 25, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 14555.16
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 10:
The number 25 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 14555.16
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The quotient of the division is 14555.16, and the remainder is 0.0.