642619 divided by 80 
The aim is to understand the frequency of 80 in 642619.

Advancing to step 1:
If we divide 6 by 80, we get 0 and a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Fetch the next digit (4) from the dividend, attach it to 6 and continue: 64 / 80

Advancing to step 2:
When dividing 64 by 80, we get 0 with a remainder of 64.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 64 and we're left with 64.
Take the next digit (2) from the dividend and append it to 64, then repeat: 642 / 80

Going ahead to step 3:
80 goes into 642 8 times with a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
Deduct 640 from 642 and we're left with 2.
Grab the next digit (6) from the dividend, add it to 2, then carry on: 26 / 80

Going ahead to step 4:
The number 80 fits into 26 0 times, leaving a remainder of 26.
Put 0 as the next digit of the answer. 
Result so far: 80.0
Deduct 0 from 26 and we're left with 26.
Append the next digit (1) from the dividend to 26 and continue with: 261 / 80

Let's proceed to step 5:
The number 80 fits into 261 3 times, leaving a remainder of 21.
Write down 3 as next digit of the result. 
Result so far: 803.0
The remainder is 21 after subtracting 240 from 261.
Fetch the next digit (9) from the dividend, attach it to 21 and continue: 219 / 80

Advancing to step 6:
219 divided by 80 is 2 with a remainder of 59.
The next digit of our result is 2. 
Result so far: 8032.0
Subtract 160 from 219 to get 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

On to step 7:
If we divide 590 by 80, we get 7 and a remainder of 30.
Use 7 as the next digit of our solution. 
Result so far: 8032.7
If we subtract 560 from 590, 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.

On to step 8:
When dividing 300 by 80, we get 3 with a remainder of 60.
The number 3 becomes the next digit in our result. 
Result so far: 8032.73
Subtracting 240 from 300 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Advancing to step 9:
600 divided by 80 is 7 with a remainder of 40.
The next digit of our result is 7. 
Result so far: 8032.737
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.

Let's proceed to step 10:
When dividing 400 by 80, we get 5 with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 8032.7375
If we take 400 away from 400, 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.

On to step 11:
80 can be fit into 0 0 times, resulting in a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 8032.7375
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 12:
80 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: 8032.7375
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.

Our division results in 8032.7375 with a remaining 0.0.