56465394 ÷ 866 
The aim is to understand the frequency of 866 in 56465394.

Step 1:
If we divide 5 by 866, we get 0 and a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Include the next digit (6) from the dividend after 5, then repeat: 56 / 866

Let's proceed to step 2:
If we divide 56 by 866, we get 0 and a remainder of 56.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 56 and we're left with 56.
Take the next digit (4) from the dividend and append it to 56, then repeat: 564 / 866

Let's proceed to step 3:
866 goes into 564 0 times with a remainder of 564.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 564 leaves us with 564.
Include the next digit (6) from the dividend after 564, then repeat: 5646 / 866

Going ahead to step 4:
5646 divided by 866 is 6 with a remainder of 450.
The next digit of our result is 6. 
Result so far: 6.0
Subtracting 5196 from 5646 leaves us with 450.
Append the next digit (5) from the dividend to 450 and continue with: 4505 / 866

Step 5:
4505 divided by 866 is 5 with a remainder of 175.
The next digit of our result is 5. 
Result so far: 65.0
Subtracting 4330 from 4505 leaves us with 175.
Bring next digit (3) of the dividend behind the 175 and repeat the process: 1753 / 866

Moving on to step 6:
1753 divided by 866 is 2 with a remainder of 21.
Write down 2 as next digit of the result. 
Result so far: 652.0
If we take 1732 away from 1753, we end up with 21.
Include the next digit (9) from the dividend after 21, then repeat: 219 / 866

Going ahead to step 7:
When dividing 219 by 866, we get 0 with a remainder of 219.
Write down 0 as next digit of the result. 
Result so far: 6520.0
If we take 0 away from 219, we end up with 219.
Append the next digit (4) from the dividend to 219 and continue with: 2194 / 866

Step 8:
The number 866 fits into 2194 2 times, leaving a remainder of 462.
The number 2 becomes the next digit in our result. 
Result so far: 65202.0
Subtracting 1732 from 2194 leaves us with 462.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4620, and continue the process.

Step 9:
The number 866 fits into 4620 5 times, leaving a remainder of 290.
Use 5 as the next digit of our solution. 
Result so far: 65202.5
Subtracting 4330 from 4620 leaves us with 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2900, and continue the process.

Advancing to step 10:
When dividing 2900 by 866, we get 3 with a remainder of 302.
Use 3 as the next digit of our solution. 
Result so far: 65202.53
Subtracting 2598 from 2900 leaves us with 302.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3020, and continue the process.

Advancing to step 11:
3020 divided by 866 is 3 with a remainder of 422.
Record the quotient 3 as the next digit in the result. 
Result so far: 65202.533
Subtracting 2598 from 3020 leaves us with 422.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4220, and continue the process.

The final outcome is 65202.533, with a leftover of 0.0422.