81618920 ÷ 801 
The aim is to understand the frequency of 801 in 81618920.

Let's proceed to step 1:
8 divided by 801 is 0 with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Fetch the next digit (1) from the dividend, attach it to 8 and continue: 81 / 801

Let's proceed to step 2:
801 goes into 81 0 times with a remainder of 81.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 81 and we're left with 81.
Fetch the next digit (6) from the dividend, attach it to 81 and continue: 816 / 801

Moving on to step 3:
When dividing 816 by 801, we get 1 with a remainder of 15.
The next digit of our result is 1. 
Result so far: 1.0
Subtract 801 from 816 to get 15.
Grab the next digit (1) from the dividend, add it to 15, then carry on: 151 / 801

Moving on to step 4:
151 divided by 801 is 0 with a remainder of 151.
Use 0 as the next digit of our solution. 
Result so far: 10.0
The remainder is 151 after subtracting 0 from 151.
Take the next digit (8) from the dividend and append it to 151, then repeat: 1518 / 801

Let's proceed to step 5:
1518 divided by 801 is 1 with a remainder of 717.
Put 1 as the next digit of the answer. 
Result so far: 101.0
If we subtract 801 from 1518, we get 717.
Fetch the next digit (9) from the dividend, attach it to 717 and continue: 7179 / 801

Advancing to step 6:
801 can be fit into 7179 8 times, resulting in a remainder of 771.
The number 8 becomes the next digit in our result. 
Result so far: 1018.0
The remainder is 771 after subtracting 6408 from 7179.
Append the next digit (2) from the dividend to 771 and continue with: 7712 / 801

Moving on to step 7:
The number 801 fits into 7712 9 times, leaving a remainder of 503.
Use 9 as the next digit of our solution. 
Result so far: 10189.0
The remainder is 503 after subtracting 7209 from 7712.
Grab the next digit (0) from the dividend, add it to 503, then carry on: 5030 / 801

Going ahead to step 8:
801 can be fit into 5030 6 times, resulting in a remainder of 224.
Use 6 as the next digit of our solution. 
Result so far: 101896.0
Deduct 4806 from 5030 and we're left with 224.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2240, and continue the process.

On to step 9:
When dividing 2240 by 801, we get 2 with a remainder of 638.
Record the quotient 2 as the next digit in the result. 
Result so far: 101896.2
The remainder is 638 after subtracting 1602 from 2240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6380, and continue the process.

Let's proceed to step 10:
801 goes into 6380 7 times with a remainder of 773.
The next digit of our result is 7. 
Result so far: 101896.27
If we take 5607 away from 6380, we end up with 773.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7730, and continue the process.

Step 11:
801 can be fit into 7730 9 times, resulting in a remainder of 521.
Write down 9 as next digit of the result. 
Result so far: 101896.279
If we take 7209 away from 7730, we end up with 521.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5210, and continue the process.

Going ahead to step 12:
801 can be fit into 5210 6 times, resulting in a remainder of 404.
Record the quotient 6 as the next digit in the result. 
Result so far: 101896.2796
Subtracting 4806 from 5210 leaves us with 404.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4040, and continue the process.

Going ahead to step 13:
The number 801 fits into 4040 5 times, leaving a remainder of 35.
Write down 5 as next digit of the result. 
Result so far: 101896.27965
The remainder is 35 after subtracting 4005 from 4040.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Moving on to step 14:
If we divide 350 by 801, we get 0 and a remainder of 350.
Use 0 as the next digit of our solution. 
Result so far: 101896.27965
Subtract 0 from 350 to get 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3500, and continue the process.

Going ahead to step 15:
The number 801 fits into 3500 4 times, leaving a remainder of 296.
Record the quotient 4 as the next digit in the result. 
Result so far: 101896.2796504
The remainder is 296 after subtracting 3204 from 3500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2960, and continue the process.

Moving on to step 16:
801 goes into 2960 3 times with a remainder of 557.
The next digit of our result is 3. 
Result so far: 101896.27965043
If we subtract 2403 from 2960, we get 557.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5570, and continue the process.

The final outcome is 101896.27965043, with a leftover of 5.57e-07.