42087485 ÷ 393 
The aim is to understand the frequency of 393 in 42087485.

Step 1:
When dividing 4 by 393, we get 0 with a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Append the next digit (2) from the dividend to 4 and continue with: 42 / 393

Going ahead to step 2:
If we divide 42 by 393, we get 0 and a remainder of 42.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 42, we end up with 42.
Grab the next digit (0) from the dividend, add it to 42, then carry on: 420 / 393

On to step 3:
393 can be fit into 420 1 times, resulting in a remainder of 27.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we subtract 393 from 420, we get 27.
Fetch the next digit (8) from the dividend, attach it to 27 and continue: 278 / 393

Advancing to step 4:
If we divide 278 by 393, we get 0 and a remainder of 278.
Use 0 as the next digit of our solution. 
Result so far: 10.0
If we take 0 away from 278, we end up with 278.
Include the next digit (7) from the dividend after 278, then repeat: 2787 / 393

Advancing to step 5:
393 can be fit into 2787 7 times, resulting in a remainder of 36.
The number 7 becomes the next digit in our result. 
Result so far: 107.0
Subtract 2751 from 2787 to get 36.
Grab the next digit (4) from the dividend, add it to 36, then carry on: 364 / 393

Advancing to step 6:
If we divide 364 by 393, we get 0 and a remainder of 364.
Write down 0 as next digit of the result. 
Result so far: 1070.0
If we subtract 0 from 364, we get 364.
Append the next digit (8) from the dividend to 364 and continue with: 3648 / 393

Let's proceed to step 7:
The number 393 fits into 3648 9 times, leaving a remainder of 111.
The next digit of our result is 9. 
Result so far: 10709.0
The remainder is 111 after subtracting 3537 from 3648.
Append the next digit (5) from the dividend to 111 and continue with: 1115 / 393

Advancing to step 8:
When dividing 1115 by 393, we get 2 with a remainder of 329.
The number 2 becomes the next digit in our result. 
Result so far: 107092.0
If we subtract 786 from 1115, we get 329.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3290, and continue the process.

Step 9:
When dividing 3290 by 393, we get 8 with a remainder of 146.
The next digit of our result is 8. 
Result so far: 107092.8
The remainder is 146 after subtracting 3144 from 3290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1460, and continue the process.

Advancing to step 10:
The number 393 fits into 1460 3 times, leaving a remainder of 281.
Use 3 as the next digit of our solution. 
Result so far: 107092.83
If we subtract 1179 from 1460, we get 281.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2810, and continue the process.

Let's proceed to step 11:
When dividing 2810 by 393, we get 7 with a remainder of 59.
The number 7 becomes the next digit in our result. 
Result so far: 107092.837
Deduct 2751 from 2810 and we're left with 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Advancing to step 12:
When dividing 590 by 393, we get 1 with a remainder of 197.
The number 1 becomes the next digit in our result. 
Result so far: 107092.8371
If we subtract 393 from 590, we get 197.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1970, and continue the process.

Going ahead to step 13:
1970 divided by 393 is 5 with a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 107092.83715
Deduct 1965 from 1970 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 14:
The number 393 fits into 50 0 times, leaving a remainder of 50.
Put 0 as the next digit of the answer. 
Result so far: 107092.83715
If we subtract 0 from 50, we get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Step 15:
500 divided by 393 is 1 with a remainder of 107.
Use 1 as the next digit of our solution. 
Result so far: 107092.8371501
If we take 393 away from 500, we end up with 107.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1070, and continue the process.

Let's proceed to step 16:
When dividing 1070 by 393, we get 2 with a remainder of 284.
Use 2 as the next digit of our solution. 
Result so far: 107092.83715012
The remainder is 284 after subtracting 786 from 1070.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2840, and continue the process.

After the division, we end up with 107092.83715012 and a remainder of 2.84e-07.