90851955 ÷ 80 
The aim is to understand the frequency of 80 in 90851955.

Going ahead to step 1:
80 goes into 9 0 times with a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 9 after subtracting 0 from 9.
Bring next digit (0) of the dividend behind the 9 and repeat the process: 90 / 80

On to step 2:
When dividing 90 by 80, we get 1 with a remainder of 10.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtract 80 from 90 to get 10.
Append the next digit (8) from the dividend to 10 and continue with: 108 / 80

Step 3:
80 goes into 108 1 times with a remainder of 28.
The number 1 becomes the next digit in our result. 
Result so far: 11.0
If we subtract 80 from 108, we get 28.
Grab the next digit (5) from the dividend, add it to 28, then carry on: 285 / 80

Step 4:
If we divide 285 by 80, we get 3 and a remainder of 45.
The next digit of our result is 3. 
Result so far: 113.0
Subtract 240 from 285 to get 45.
Include the next digit (1) from the dividend after 45, then repeat: 451 / 80

Going ahead to step 5:
If we divide 451 by 80, we get 5 and a remainder of 51.
Record the quotient 5 as the next digit in the result. 
Result so far: 1135.0
The remainder is 51 after subtracting 400 from 451.
Take the next digit (9) from the dividend and append it to 51, then repeat: 519 / 80

Moving on to step 6:
80 can be fit into 519 6 times, resulting in a remainder of 39.
The next digit of our result is 6. 
Result so far: 11356.0
Subtract 480 from 519 to get 39.
Bring next digit (5) of the dividend behind the 39 and repeat the process: 395 / 80

Advancing to step 7:
395 divided by 80 is 4 with a remainder of 75.
The next digit of our result is 4. 
Result so far: 113564.0
Deduct 320 from 395 and we're left with 75.
Take the next digit (5) from the dividend and append it to 75, then repeat: 755 / 80

Advancing to step 8:
When dividing 755 by 80, we get 9 with a remainder of 35.
Put 9 as the next digit of the answer. 
Result so far: 1135649.0
Subtract 720 from 755 to get 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Advancing to step 9:
80 goes into 350 4 times with a remainder of 30.
Use 4 as the next digit of our solution. 
Result so far: 1135649.4
If we subtract 320 from 350, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Moving on to step 10:
When dividing 300 by 80, we get 3 with a remainder of 60.
The next digit of our result is 3. 
Result so far: 1135649.43
The remainder is 60 after subtracting 240 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Going ahead to step 11:
If we divide 600 by 80, we get 7 and a remainder of 40.
Write down 7 as next digit of the result. 
Result so far: 1135649.437
Subtract 560 from 600 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 12:
The number 80 fits into 400 5 times, leaving a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 1135649.4375
Deduct 400 from 400 and we're left 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 13:
0 divided by 80 is 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 1135649.4375
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 14:
80 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 1135649.4375
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 1135649.4375 with a remainder of 0.0.