15945069 ÷ 642 
The aim is to understand the frequency of 642 in 15945069.

Let's proceed to step 1:
When dividing 1 by 642, we get 0 with 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.
Bring next digit (5) of the dividend behind the 1 and repeat the process: 15 / 642

Moving on to step 2:
15 divided by 642 is 0 with a remainder of 15.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 15, we end up with 15.
Bring next digit (9) of the dividend behind the 15 and repeat the process: 159 / 642

Let's proceed to step 3:
159 divided by 642 is 0 with a remainder of 159.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 159, we get 159.
Append the next digit (4) from the dividend to 159 and continue with: 1594 / 642

Moving on to step 4:
642 can be fit into 1594 2 times, resulting in a remainder of 310.
Write down 2 as next digit of the result. 
Result so far: 2.0
If we subtract 1284 from 1594, we get 310.
Include the next digit (5) from the dividend after 310, then repeat: 3105 / 642

On to step 5:
3105 divided by 642 is 4 with a remainder of 537.
The number 4 becomes the next digit in our result. 
Result so far: 24.0
Deduct 2568 from 3105 and we're left with 537.
Take the next digit (0) from the dividend and append it to 537, then repeat: 5370 / 642

On to step 6:
If we divide 5370 by 642, we get 8 and a remainder of 234.
The number 8 becomes the next digit in our result. 
Result so far: 248.0
The remainder is 234 after subtracting 5136 from 5370.
Bring next digit (6) of the dividend behind the 234 and repeat the process: 2346 / 642

Going ahead to step 7:
If we divide 2346 by 642, we get 3 and a remainder of 420.
Write down 3 as next digit of the result. 
Result so far: 2483.0
If we subtract 1926 from 2346, we get 420.
Bring next digit (9) of the dividend behind the 420 and repeat the process: 4209 / 642

Advancing to step 8:
When dividing 4209 by 642, we get 6 with a remainder of 357.
Put 6 as the next digit of the answer. 
Result so far: 24836.0
Subtracting 3852 from 4209 leaves us with 357.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3570, and continue the process.

Moving on to step 9:
The number 642 fits into 3570 5 times, leaving a remainder of 360.
Record the quotient 5 as the next digit in the result. 
Result so far: 24836.5
Deduct 3210 from 3570 and we're left with 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

On to step 10:
When dividing 3600 by 642, we get 5 with a remainder of 390.
The number 5 becomes the next digit in our result. 
Result so far: 24836.55
If we subtract 3210 from 3600, we get 390.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3900, and continue the process.

The final outcome is 24836.55, with a leftover of 0.39.