66439446 ÷ 856 
The aim is to understand the frequency of 856 in 66439446.

Step 1:
When dividing 6 by 856, we get 0 with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Take the next digit (6) from the dividend and append it to 6, then repeat: 66 / 856

Step 2:
856 goes into 66 0 times with a remainder of 66.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 66 and we're left with 66.
Grab the next digit (4) from the dividend, add it to 66, then carry on: 664 / 856

On to step 3:
856 can be fit into 664 0 times, resulting in a remainder of 664.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 664 leaves us with 664.
Append the next digit (3) from the dividend to 664 and continue with: 6643 / 856

Advancing to step 4:
6643 divided by 856 is 7 with a remainder of 651.
Put 7 as the next digit of the answer. 
Result so far: 7.0
Subtract 5992 from 6643 to get 651.
Grab the next digit (9) from the dividend, add it to 651, then carry on: 6519 / 856

Step 5:
When dividing 6519 by 856, we get 7 with a remainder of 527.
The number 7 becomes the next digit in our result. 
Result so far: 77.0
The remainder is 527 after subtracting 5992 from 6519.
Grab the next digit (4) from the dividend, add it to 527, then carry on: 5274 / 856

On to step 6:
If we divide 5274 by 856, we get 6 and a remainder of 138.
The next digit of our result is 6. 
Result so far: 776.0
If we subtract 5136 from 5274, we get 138.
Include the next digit (4) from the dividend after 138, then repeat: 1384 / 856

Going ahead to step 7:
If we divide 1384 by 856, we get 1 and a remainder of 528.
The next digit of our result is 1. 
Result so far: 7761.0
Subtract 856 from 1384 to get 528.
Take the next digit (6) from the dividend and append it to 528, then repeat: 5286 / 856

Going ahead to step 8:
856 can be fit into 5286 6 times, resulting in a remainder of 150.
The number 6 becomes the next digit in our result. 
Result so far: 77616.0
If we subtract 5136 from 5286, we get 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

Step 9:
856 goes into 1500 1 times with a remainder of 644.
Put 1 as the next digit of the answer. 
Result so far: 77616.1
Deduct 856 from 1500 and we're left with 644.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6440, and continue the process.

Moving on to step 10:
856 can be fit into 6440 7 times, resulting in a remainder of 448.
Use 7 as the next digit of our solution. 
Result so far: 77616.17
If we subtract 5992 from 6440, we get 448.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4480, and continue the process.

Let's proceed to step 11:
If we divide 4480 by 856, we get 5 and a remainder of 200.
The number 5 becomes the next digit in our result. 
Result so far: 77616.175
Deduct 4280 from 4480 and we're left with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Step 12:
If we divide 2000 by 856, we get 2 and a remainder of 288.
Put 2 as the next digit of the answer. 
Result so far: 77616.1752
Subtracting 1712 from 2000 leaves us with 288.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2880, and continue the process.

Moving on to step 13:
856 goes into 2880 3 times with a remainder of 312.
Use 3 as the next digit of our solution. 
Result so far: 77616.17523
The remainder is 312 after subtracting 2568 from 2880.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3120, and continue the process.

Let's proceed to step 14:
856 can be fit into 3120 3 times, resulting in a remainder of 552.
Use 3 as the next digit of our solution. 
Result so far: 77616.175233
If we subtract 2568 from 3120, we get 552.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5520, and continue the process.

The final result is 77616.175233 with a remainder of 5.52e-05.