4079980 ÷ 805 
The aim is to understand the frequency of 805 in 4079980.

Step 1:
4 divided by 805 is 0 with a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Fetch the next digit (0) from the dividend, attach it to 4 and continue: 40 / 805

Advancing to step 2:
40 divided by 805 is 0 with a remainder of 40.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 40 and we're left with 40.
Append the next digit (7) from the dividend to 40 and continue with: 407 / 805

Advancing to step 3:
When dividing 407 by 805, we get 0 with a remainder of 407.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 407 and we're left with 407.
Include the next digit (9) from the dividend after 407, then repeat: 4079 / 805

Going ahead to step 4:
4079 divided by 805 is 5 with a remainder of 54.
Write down 5 as next digit of the result. 
Result so far: 5.0
If we take 4025 away from 4079, we end up with 54.
Grab the next digit (9) from the dividend, add it to 54, then carry on: 549 / 805

Moving on to step 5:
805 can be fit into 549 0 times, resulting in a remainder of 549.
Write down 0 as next digit of the result. 
Result so far: 50.0
Subtracting 0 from 549 leaves us with 549.
Take the next digit (8) from the dividend and append it to 549, then repeat: 5498 / 805

Moving on to step 6:
805 can be fit into 5498 6 times, resulting in a remainder of 668.
Use 6 as the next digit of our solution. 
Result so far: 506.0
The remainder is 668 after subtracting 4830 from 5498.
Bring next digit (0) of the dividend behind the 668 and repeat the process: 6680 / 805

Going ahead to step 7:
6680 divided by 805 is 8 with a remainder of 240.
Use 8 as the next digit of our solution. 
Result so far: 5068.0
Deduct 6440 from 6680 and we're left with 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Going ahead to step 8:
2400 divided by 805 is 2 with a remainder of 790.
Record the quotient 2 as the next digit in the result. 
Result so far: 5068.2
The remainder is 790 after subtracting 1610 from 2400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7900, and continue the process.

Step 9:
805 goes into 7900 9 times with a remainder of 655.
Use 9 as the next digit of our solution. 
Result so far: 5068.29
If we take 7245 away from 7900, we end up with 655.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6550, and continue the process.

Step 10:
6550 divided by 805 is 8 with a remainder of 110.
Use 8 as the next digit of our solution. 
Result so far: 5068.298
If we subtract 6440 from 6550, we get 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Step 11:
805 goes into 1100 1 times with a remainder of 295.
The next digit of our result is 1. 
Result so far: 5068.2981
If we take 805 away from 1100, we end up with 295.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2950, and continue the process.

Advancing to step 12:
805 can be fit into 2950 3 times, resulting in a remainder of 535.
Record the quotient 3 as the next digit in the result. 
Result so far: 5068.29813
Deduct 2415 from 2950 and we're left with 535.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5350, and continue the process.

Step 13:
When dividing 5350 by 805, we get 6 with a remainder of 520.
Write down 6 as next digit of the result. 
Result so far: 5068.298136
Subtract 4830 from 5350 to get 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5200, and continue the process.

Let's proceed to step 14:
The number 805 fits into 5200 6 times, leaving a remainder of 370.
Write down 6 as next digit of the result. 
Result so far: 5068.2981366
Subtracting 4830 from 5200 leaves us with 370.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3700, and continue the process.

The final outcome is 5068.2981366, with a leftover of 3.7e-06.