Let's divide 85391588 by 642
The aim is to understand the frequency of 642 in 85391588.

Step 1:
642 goes into 8 0 times with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Append the next digit (5) from the dividend to 8 and continue with: 85 / 642

Moving on to step 2:
When dividing 85 by 642, we get 0 with a remainder of 85.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 85, we end up with 85.
Include the next digit (3) from the dividend after 85, then repeat: 853 / 642

Step 3:
The number 642 fits into 853 1 times, leaving a remainder of 211.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 211 after subtracting 642 from 853.
Include the next digit (9) from the dividend after 211, then repeat: 2119 / 642

Step 4:
When dividing 2119 by 642, we get 3 with a remainder of 193.
Put 3 as the next digit of the answer. 
Result so far: 13.0
Subtracting 1926 from 2119 leaves us with 193.
Take the next digit (1) from the dividend and append it to 193, then repeat: 1931 / 642

Moving on to step 5:
The number 642 fits into 1931 3 times, leaving a remainder of 5.
The next digit of our result is 3. 
Result so far: 133.0
The remainder is 5 after subtracting 1926 from 1931.
Fetch the next digit (5) from the dividend, attach it to 5 and continue: 55 / 642

On to step 6:
If we divide 55 by 642, we get 0 and a remainder of 55.
Write down 0 as next digit of the result. 
Result so far: 1330.0
If we take 0 away from 55, we end up with 55.
Fetch the next digit (8) from the dividend, attach it to 55 and continue: 558 / 642

Advancing to step 7:
642 can be fit into 558 0 times, resulting in a remainder of 558.
Put 0 as the next digit of the answer. 
Result so far: 13300.0
If we take 0 away from 558, we end up with 558.
Append the next digit (8) from the dividend to 558 and continue with: 5588 / 642

Moving on to step 8:
If we divide 5588 by 642, we get 8 and a remainder of 452.
Write down 8 as next digit of the result. 
Result so far: 133008.0
Subtracting 5136 from 5588 leaves us with 452.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4520, and continue the process.

Step 9:
The number 642 fits into 4520 7 times, leaving a remainder of 26.
Use 7 as the next digit of our solution. 
Result so far: 133008.7
The remainder is 26 after subtracting 4494 from 4520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

On to step 10:
642 can be fit into 260 0 times, resulting in a remainder of 260.
Put 0 as the next digit of the answer. 
Result so far: 133008.7
If we take 0 away from 260, we end up with 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

On to step 11:
When dividing 2600 by 642, we get 4 with a remainder of 32.
Use 4 as the next digit of our solution. 
Result so far: 133008.704
Subtract 2568 from 2600 to get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Advancing to step 12:
When dividing 320 by 642, we get 0 with a remainder of 320.
Write down 0 as next digit of the result. 
Result so far: 133008.704
Deduct 0 from 320 and we're left with 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Advancing to step 13:
If we divide 3200 by 642, we get 4 and a remainder of 632.
Put 4 as the next digit of the answer. 
Result so far: 133008.70404
Subtracting 2568 from 3200 leaves us with 632.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6320, and continue the process.

Advancing to step 14:
The number 642 fits into 6320 9 times, leaving a remainder of 542.
The number 9 becomes the next digit in our result. 
Result so far: 133008.704049
If we take 5778 away from 6320, we end up with 542.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5420, and continue the process.

Step 15:
5420 divided by 642 is 8 with a remainder of 284.
Record the quotient 8 as the next digit in the result. 
Result so far: 133008.7040498
Subtract 5136 from 5420 to get 284.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2840, and continue the process.

Moving on to step 16:
When dividing 2840 by 642, we get 4 with a remainder of 272.
Use 4 as the next digit of our solution. 
Result so far: 133008.70404984
Subtracting 2568 from 2840 leaves us with 272.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2720, and continue the process.

The final outcome is 133008.70404984, with a leftover of 2.72e-07.