We look at the division of 16567738 by 642 
The aim is to understand the frequency of 642 in 16567738.

Advancing to step 1:
642 can be fit into 1 0 times, resulting in a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Take the next digit (6) from the dividend and append it to 1, then repeat: 16 / 642

Going ahead to step 2:
642 goes into 16 0 times with a remainder of 16.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 16, we get 16.
Bring next digit (5) of the dividend behind the 16 and repeat the process: 165 / 642

On to step 3:
165 divided by 642 is 0 with a remainder of 165.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 165 to get 165.
Fetch the next digit (6) from the dividend, attach it to 165 and continue: 1656 / 642

Let's proceed to step 4:
The number 642 fits into 1656 2 times, leaving a remainder of 372.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Deduct 1284 from 1656 and we're left with 372.
Grab the next digit (7) from the dividend, add it to 372, then carry on: 3727 / 642

Advancing to step 5:
When dividing 3727 by 642, we get 5 with a remainder of 517.
Write down 5 as next digit of the result. 
Result so far: 25.0
Subtracting 3210 from 3727 leaves us with 517.
Grab the next digit (7) from the dividend, add it to 517, then carry on: 5177 / 642

Advancing to step 6:
642 goes into 5177 8 times with a remainder of 41.
The next digit of our result is 8. 
Result so far: 258.0
Subtracting 5136 from 5177 leaves us with 41.
Include the next digit (3) from the dividend after 41, then repeat: 413 / 642

On to step 7:
The number 642 fits into 413 0 times, leaving a remainder of 413.
Write down 0 as next digit of the result. 
Result so far: 2580.0
If we subtract 0 from 413, we get 413.
Bring next digit (8) of the dividend behind the 413 and repeat the process: 4138 / 642

Advancing to step 8:
642 can be fit into 4138 6 times, resulting in a remainder of 286.
Use 6 as the next digit of our solution. 
Result so far: 25806.0
Subtract 3852 from 4138 to get 286.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2860, and continue the process.

Advancing to step 9:
2860 divided by 642 is 4 with a remainder of 292.
The number 4 becomes the next digit in our result. 
Result so far: 25806.4
Deduct 2568 from 2860 and we're left with 292.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2920, and continue the process.

On to step 10:
642 goes into 2920 4 times with a remainder of 352.
Write down 4 as next digit of the result. 
Result so far: 25806.44
If we take 2568 away from 2920, we end up with 352.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3520, and continue the process.

The final result is 25806.44 with a remainder of 0.352.