We look at the division of 81560757 by 451 
The aim is to understand the frequency of 451 in 81560757.

Going ahead to step 1:
When dividing 8 by 451, we get 0 with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Include the next digit (1) from the dividend after 8, then repeat: 81 / 451

On to step 2:
When dividing 81 by 451, we get 0 with a remainder of 81.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 81 to get 81.
Append the next digit (5) from the dividend to 81 and continue with: 815 / 451

On to step 3:
451 goes into 815 1 times with a remainder of 364.
The next digit of our result is 1. 
Result so far: 1.0
If we take 451 away from 815, we end up with 364.
Bring next digit (6) of the dividend behind the 364 and repeat the process: 3646 / 451

On to step 4:
3646 divided by 451 is 8 with a remainder of 38.
Record the quotient 8 as the next digit in the result. 
Result so far: 18.0
Deduct 3608 from 3646 and we're left with 38.
Include the next digit (0) from the dividend after 38, then repeat: 380 / 451

Moving on to step 5:
The number 451 fits into 380 0 times, leaving a remainder of 380.
The number 0 becomes the next digit in our result. 
Result so far: 180.0
Subtracting 0 from 380 leaves us with 380.
Include the next digit (7) from the dividend after 380, then repeat: 3807 / 451

On to step 6:
The number 451 fits into 3807 8 times, leaving a remainder of 199.
Put 8 as the next digit of the answer. 
Result so far: 1808.0
The remainder is 199 after subtracting 3608 from 3807.
Append the next digit (5) from the dividend to 199 and continue with: 1995 / 451

Moving on to step 7:
1995 divided by 451 is 4 with a remainder of 191.
Record the quotient 4 as the next digit in the result. 
Result so far: 18084.0
Subtract 1804 from 1995 to get 191.
Bring next digit (7) of the dividend behind the 191 and repeat the process: 1917 / 451

Step 8:
The number 451 fits into 1917 4 times, leaving a remainder of 113.
The next digit of our result is 4. 
Result so far: 180844.0
Deduct 1804 from 1917 and we're left with 113.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1130, and continue the process.

Step 9:
When dividing 1130 by 451, we get 2 with a remainder of 228.
Put 2 as the next digit of the answer. 
Result so far: 180844.2
Deduct 902 from 1130 and we're left with 228.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2280, and continue the process.

Going ahead to step 10:
451 can be fit into 2280 5 times, resulting in a remainder of 25.
Use 5 as the next digit of our solution. 
Result so far: 180844.25
If we subtract 2255 from 2280, we get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Advancing to step 11:
250 divided by 451 is 0 with a remainder of 250.
The next digit of our result is 0. 
Result so far: 180844.25
Subtract 0 from 250 to get 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2500, and continue the process.

Step 12:
2500 divided by 451 is 5 with a remainder of 245.
Use 5 as the next digit of our solution. 
Result so far: 180844.2505
Deduct 2255 from 2500 and we're left with 245.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2450, and continue the process.

Moving on to step 13:
When dividing 2450 by 451, we get 5 with a remainder of 195.
The next digit of our result is 5. 
Result so far: 180844.25055
Deduct 2255 from 2450 and we're left with 195.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1950, and continue the process.

The quotient of the division is 180844.25055, and the remainder is 0.000195.