85864633 ÷ 644 
The aim is to understand the frequency of 644 in 85864633.

Advancing to step 1:
644 can be fit into 8 0 times, resulting in a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Fetch the next digit (5) from the dividend, attach it to 8 and continue: 85 / 644

Step 2:
85 divided by 644 is 0 with a remainder of 85.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 85 to get 85.
Bring next digit (8) of the dividend behind the 85 and repeat the process: 858 / 644

Going ahead to step 3:
644 can be fit into 858 1 times, resulting in a remainder of 214.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 644 from 858 to get 214.
Bring next digit (6) of the dividend behind the 214 and repeat the process: 2146 / 644

Moving on to step 4:
If we divide 2146 by 644, we get 3 and a remainder of 214.
Record the quotient 3 as the next digit in the result. 
Result so far: 13.0
The remainder is 214 after subtracting 1932 from 2146.
Append the next digit (4) from the dividend to 214 and continue with: 2144 / 644

Let's proceed to step 5:
2144 divided by 644 is 3 with a remainder of 212.
Put 3 as the next digit of the answer. 
Result so far: 133.0
If we take 1932 away from 2144, we end up with 212.
Take the next digit (6) from the dividend and append it to 212, then repeat: 2126 / 644

Step 6:
2126 divided by 644 is 3 with a remainder of 194.
Record the quotient 3 as the next digit in the result. 
Result so far: 1333.0
The remainder is 194 after subtracting 1932 from 2126.
Append the next digit (3) from the dividend to 194 and continue with: 1943 / 644

On to step 7:
The number 644 fits into 1943 3 times, leaving a remainder of 11.
Record the quotient 3 as the next digit in the result. 
Result so far: 13333.0
If we take 1932 away from 1943, we end up with 11.
Include the next digit (3) from the dividend after 11, then repeat: 113 / 644

Going ahead to step 8:
The number 644 fits into 113 0 times, leaving a remainder of 113.
Put 0 as the next digit of the answer. 
Result so far: 133330.0
Subtracting 0 from 113 leaves us with 113.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1130, and continue the process.

On to step 9:
1130 divided by 644 is 1 with a remainder of 486.
Use 1 as the next digit of our solution. 
Result so far: 133330.1
Subtract 644 from 1130 to get 486.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4860, and continue the process.

Let's proceed to step 10:
If we divide 4860 by 644, we get 7 and a remainder of 352.
Use 7 as the next digit of our solution. 
Result so far: 133330.17
Subtracting 4508 from 4860 leaves us 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.

Going ahead to step 11:
The number 644 fits into 3520 5 times, leaving a remainder of 300.
Put 5 as the next digit of the answer. 
Result so far: 133330.175
The remainder is 300 after subtracting 3220 from 3520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Step 12:
644 goes into 3000 4 times with a remainder of 424.
The next digit of our result is 4. 
Result so far: 133330.1754
If we take 2576 away from 3000, we end up with 424.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4240, and continue the process.

Going ahead to step 13:
4240 divided by 644 is 6 with a remainder of 376.
Record the quotient 6 as the next digit in the result. 
Result so far: 133330.17546
The remainder is 376 after subtracting 3864 from 4240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3760, and continue the process.

Moving on to step 14:
644 goes into 3760 5 times with a remainder of 540.
The number 5 becomes the next digit in our result. 
Result so far: 133330.175465
The remainder is 540 after subtracting 3220 from 3760.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5400, and continue the process.

Let's proceed to step 15:
The number 644 fits into 5400 8 times, leaving a remainder of 248.
Put 8 as the next digit of the answer. 
Result so far: 133330.1754658
Deduct 5152 from 5400 and we're left with 248.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2480, and continue the process.

Moving on to step 16:
If we divide 2480 by 644, we get 3 and a remainder of 548.
Use 3 as the next digit of our solution. 
Result so far: 133330.17546583
The remainder is 548 after subtracting 1932 from 2480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5480, and continue the process.

The final result is 133330.17546583 with a remainder of 5.48e-07.