3550549 ÷ 253 
The aim is to understand the frequency of 253 in 3550549.

Step 1:
If we divide 3 by 253, we get 0 and a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Fetch the next digit (5) from the dividend, attach it to 3 and continue: 35 / 253

Moving on to step 2:
If we divide 35 by 253, we get 0 and a remainder of 35.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 35, we end up with 35.
Grab the next digit (5) from the dividend, add it to 35, then carry on: 355 / 253

Step 3:
When dividing 355 by 253, we get 1 with a remainder of 102.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we take 253 away from 355, we end up with 102.
Grab the next digit (0) from the dividend, add it to 102, then carry on: 1020 / 253

Moving on to step 4:
When dividing 1020 by 253, we get 4 with a remainder of 8.
The number 4 becomes the next digit in our result. 
Result so far: 14.0
If we take 1012 away from 1020, we end up with 8.
Include the next digit (5) from the dividend after 8, then repeat: 85 / 253

On to step 5:
253 goes into 85 0 times with a remainder of 85.
Write down 0 as next digit of the result. 
Result so far: 140.0
Subtracting 0 from 85 leaves us with 85.
Append the next digit (4) from the dividend to 85 and continue with: 854 / 253

Step 6:
The number 253 fits into 854 3 times, leaving a remainder of 95.
The next digit of our result is 3. 
Result so far: 1403.0
Deduct 759 from 854 and we're left with 95.
Grab the next digit (9) from the dividend, add it to 95, then carry on: 959 / 253

Step 7:
When dividing 959 by 253, we get 3 with a remainder of 200.
Record the quotient 3 as the next digit in the result. 
Result so far: 14033.0
If we subtract 759 from 959, we get 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Let's proceed to step 8:
253 goes into 2000 7 times with a remainder of 229.
Use 7 as the next digit of our solution. 
Result so far: 14033.7
Subtracting 1771 from 2000 leaves us with 229.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2290, and continue the process.

Let's proceed to step 9:
2290 divided by 253 is 9 with a remainder of 13.
The number 9 becomes the next digit in our result. 
Result so far: 14033.79
If we subtract 2277 from 2290, we get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Going ahead to step 10:
The number 253 fits into 130 0 times, leaving a remainder of 130.
Use 0 as the next digit of our solution. 
Result so far: 14033.79
Deduct 0 from 130 and we're left with 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

On to step 11:
If we divide 1300 by 253, we get 5 and a remainder of 35.
The next digit of our result is 5. 
Result so far: 14033.7905
The remainder is 35 after subtracting 1265 from 1300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Step 12:
350 divided by 253 is 1 with a remainder of 97.
Put 1 as the next digit of the answer. 
Result so far: 14033.79051
Deduct 253 from 350 and we're left with 97.
Since there are no more digits in the dividend, we add a zero to the remainder making it 970, and continue the process.

On to step 13:
970 divided by 253 is 3 with a remainder of 211.
Record the quotient 3 as the next digit in the result. 
Result so far: 14033.790513
Subtracting 759 from 970 leaves us with 211.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2110, and continue the process.

Let's proceed to step 14:
The number 253 fits into 2110 8 times, leaving a remainder of 86.
The number 8 becomes the next digit in our result. 
Result so far: 14033.7905138
Subtracting 2024 from 2110 leaves us with 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Going ahead to step 15:
860 divided by 253 is 3 with a remainder of 101.
Put 3 as the next digit of the answer. 
Result so far: 14033.79051383
Subtracting 759 from 860 leaves us with 101.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1010, and continue the process.

The final outcome is 14033.79051383, with a leftover of 1.01e-07.