Let's divide 71353825 by 800
The aim is to understand the frequency of 800 in 71353825.

On to step 1:
7 divided by 800 is 0 with a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Fetch the next digit (1) from the dividend, attach it to 7 and continue: 71 / 800

Let's proceed to step 2:
The number 800 fits into 71 0 times, leaving a remainder of 71.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 71, we get 71.
Bring next digit (3) of the dividend behind the 71 and repeat the process: 713 / 800

Step 3:
When dividing 713 by 800, we get 0 with a remainder of 713.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 713 after subtracting 0 from 713.
Fetch the next digit (5) from the dividend, attach it to 713 and continue: 7135 / 800

Advancing to step 4:
800 goes into 7135 8 times with a remainder of 735.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
The remainder is 735 after subtracting 6400 from 7135.
Bring next digit (3) of the dividend behind the 735 and repeat the process: 7353 / 800

Step 5:
The number 800 fits into 7353 9 times, leaving a remainder of 153.
Record the quotient 9 as the next digit in the result. 
Result so far: 89.0
Deduct 7200 from 7353 and we're left with 153.
Grab the next digit (8) from the dividend, add it to 153, then carry on: 1538 / 800

Moving on to step 6:
1538 divided by 800 is 1 with a remainder of 738.
Put 1 as the next digit of the answer. 
Result so far: 891.0
Deduct 800 from 1538 and we're left with 738.
Append the next digit (2) from the dividend to 738 and continue with: 7382 / 800

Let's proceed to step 7:
7382 divided by 800 is 9 with a remainder of 182.
Use 9 as the next digit of our solution. 
Result so far: 8919.0
Subtract 7200 from 7382 to get 182.
Take the next digit (5) from the dividend and append it to 182, then repeat: 1825 / 800

Going ahead to step 8:
800 can be fit into 1825 2 times, resulting in a remainder of 225.
The next digit of our result is 2. 
Result so far: 89192.0
If we take 1600 away from 1825, we end up with 225.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2250, and continue the process.

On to step 9:
If we divide 2250 by 800, we get 2 and a remainder of 650.
Put 2 as the next digit of the answer. 
Result so far: 89192.2
Subtract 1600 from 2250 to get 650.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6500, and continue the process.

Moving on to step 10:
The number 800 fits into 6500 8 times, leaving a remainder of 100.
Put 8 as the next digit of the answer. 
Result so far: 89192.28
Deduct 6400 from 6500 and we're left with 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Moving on to step 11:
The number 800 fits into 1000 1 times, leaving a remainder of 200.
Put 1 as the next digit of the answer. 
Result so far: 89192.281
If we take 800 away from 1000, we end up with 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 12:
If we divide 2000 by 800, we get 2 and a remainder of 400.
Put 2 as the next digit of the answer. 
Result so far: 89192.2812
Subtract 1600 from 2000 to get 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Step 13:
When dividing 4000 by 800, we get 5 with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 89192.28125
Subtracting 4000 from 4000 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.

On to step 14:
800 can be fit into 0 0 times, resulting in a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 89192.28125
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.

Moving on to step 15:
800 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 89192.28125
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.

The final result is 89192.28125 with a remainder of 0.0.