We look at the division of 45421687 by 135 
The aim is to understand the frequency of 135 in 45421687.

Step 1:
The number 135 fits into 4 0 times, leaving a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Fetch the next digit (5) from the dividend, attach it to 4 and continue: 45 / 135

Step 2:
135 can be fit into 45 0 times, resulting in a remainder of 45.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 45 leaves us with 45.
Take the next digit (4) from the dividend and append it to 45, then repeat: 454 / 135

On to step 3:
135 can be fit into 454 3 times, resulting in a remainder of 49.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
Deduct 405 from 454 and we're left with 49.
Fetch the next digit (2) from the dividend, attach it to 49 and continue: 492 / 135

On to step 4:
If we divide 492 by 135, we get 3 and a remainder of 87.
The next digit of our result is 3. 
Result so far: 33.0
The remainder is 87 after subtracting 405 from 492.
Bring next digit (1) of the dividend behind the 87 and repeat the process: 871 / 135

On to step 5:
If we divide 871 by 135, we get 6 and a remainder of 61.
Put 6 as the next digit of the answer. 
Result so far: 336.0
Deduct 810 from 871 and we're left with 61.
Append the next digit (6) from the dividend to 61 and continue with: 616 / 135

On to step 6:
If we divide 616 by 135, we get 4 and a remainder of 76.
The number 4 becomes the next digit in our result. 
Result so far: 3364.0
Deduct 540 from 616 and we're left with 76.
Take the next digit (8) from the dividend and append it to 76, then repeat: 768 / 135

Advancing to step 7:
The number 135 fits into 768 5 times, leaving a remainder of 93.
Put 5 as the next digit of the answer. 
Result so far: 33645.0
Subtract 675 from 768 to get 93.
Fetch the next digit (7) from the dividend, attach it to 93 and continue: 937 / 135

Moving on to step 8:
135 can be fit into 937 6 times, resulting in a remainder of 127.
The number 6 becomes the next digit in our result. 
Result so far: 336456.0
Deduct 810 from 937 and we're left with 127.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1270, and continue the process.

Going ahead to step 9:
135 goes into 1270 9 times with a remainder of 55.
Use 9 as the next digit of our solution. 
Result so far: 336456.9
If we subtract 1215 from 1270, we get 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Advancing to step 10:
If we divide 550 by 135, we get 4 and a remainder of 10.
The number 4 becomes the next digit in our result. 
Result so far: 336456.94
If we take 540 away from 550, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 11:
When dividing 100 by 135, we get 0 with a remainder of 100.
The number 0 becomes the next digit in our result. 
Result so far: 336456.94
Deduct 0 from 100 and we're left with 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

On to step 12:
135 goes into 1000 7 times with a remainder of 55.
Write down 7 as next digit of the result. 
Result so far: 336456.9407
If we subtract 945 from 1000, we get 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

On to step 13:
If we divide 550 by 135, we get 4 and a remainder of 10.
Record the quotient 4 as the next digit in the result. 
Result so far: 336456.94074
The remainder is 10 after subtracting 540 from 550.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 14:
135 goes into 100 0 times with a remainder of 100.
Write down 0 as next digit of the result. 
Result so far: 336456.94074
Subtract 0 from 100 to get 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Step 15:
The number 135 fits into 1000 7 times, leaving a remainder of 55.
Use 7 as the next digit of our solution. 
Result so far: 336456.9407407
The remainder is 55 after subtracting 945 from 1000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Step 16:
If we divide 550 by 135, we get 4 and a remainder of 10.
The number 4 becomes the next digit in our result. 
Result so far: 336456.94074074
If we subtract 540 from 550, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final result is 336456.94074074 with a remainder of 1e-08.