99833562 ÷ 642 
The aim is to understand the frequency of 642 in 99833562.

Step 1:
If we divide 9 by 642, we get 0 and a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Grab the next digit (9) from the dividend, add it to 9, then carry on: 99 / 642

On to step 2:
99 divided by 642 is 0 with a remainder of 99.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 99, we get 99.
Append the next digit (8) from the dividend to 99 and continue with: 998 / 642

Moving on to step 3:
642 goes into 998 1 times with a remainder of 356.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 642 from 998 to get 356.
Append the next digit (3) from the dividend to 356 and continue with: 3563 / 642

Moving on to step 4:
3563 divided by 642 is 5 with a remainder of 353.
The next digit of our result is 5. 
Result so far: 15.0
The remainder is 353 after subtracting 3210 from 3563.
Bring next digit (3) of the dividend behind the 353 and repeat the process: 3533 / 642

Moving on to step 5:
642 goes into 3533 5 times with a remainder of 323.
Write down 5 as next digit of the result. 
Result so far: 155.0
Subtracting 3210 from 3533 leaves us with 323.
Append the next digit (5) from the dividend to 323 and continue with: 3235 / 642

Going ahead to step 6:
642 can be fit into 3235 5 times, resulting in a remainder of 25.
Use 5 as the next digit of our solution. 
Result so far: 1555.0
Subtract 3210 from 3235 to get 25.
Take the next digit (6) from the dividend and append it to 25, then repeat: 256 / 642

Moving on to step 7:
642 can be fit into 256 0 times, resulting in a remainder of 256.
Put 0 as the next digit of the answer. 
Result so far: 15550.0
Deduct 0 from 256 and we're left with 256.
Append the next digit (2) from the dividend to 256 and continue with: 2562 / 642

Going ahead to step 8:
When dividing 2562 by 642, we get 3 with a remainder of 636.
Record the quotient 3 as the next digit in the result. 
Result so far: 155503.0
Subtract 1926 from 2562 to get 636.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6360, and continue the process.

Step 9:
642 can be fit into 6360 9 times, resulting in a remainder of 582.
Record the quotient 9 as the next digit in the result. 
Result so far: 155503.9
The remainder is 582 after subtracting 5778 from 6360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5820, and continue the process.

Moving on to step 10:
5820 divided by 642 is 9 with a remainder of 42.
The number 9 becomes the next digit in our result. 
Result so far: 155503.99
If we take 5778 away from 5820, we end up with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

The final outcome is 155503.99, with a leftover of 0.042.