66866 ÷ 45 
We want to divide 66866 by 45.

On to step 1:
The number 45 fits into 6 0 times, leaving a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Grab the next digit (6) from the dividend, add it to 6, then carry on: 66 / 45

On to step 2:
45 can be fit into 66 1 times, resulting in a remainder of 21.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 45 from 66 leaves us with 21.
Fetch the next digit (8) from the dividend, attach it to 21 and continue: 218 / 45

Moving on to step 3:
218 divided by 45 is 4 with a remainder of 38.
Use 4 as the next digit of our solution. 
Result so far: 14.0
Subtract 180 from 218 to get 38.
Append the next digit (6) from the dividend to 38 and continue with: 386 / 45

Advancing to step 4:
When dividing 386 by 45, we get 8 with a remainder of 26.
Write down 8 as next digit of the result. 
Result so far: 148.0
The remainder is 26 after subtracting 360 from 386.
Grab the next digit (6) from the dividend, add it to 26, then carry on: 266 / 45

Step 5:
45 can be fit into 266 5 times, resulting in a remainder of 41.
The number 5 becomes the next digit in our result. 
Result so far: 1485.0
Deduct 225 from 266 and we're left with 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Step 6:
45 goes into 410 9 times with a remainder of 5.
Use 9 as the next digit of our solution. 
Result so far: 1485.9
Subtracting 405 from 410 leaves us 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.

On to step 7:
45 can be fit into 50 1 times, resulting in a remainder of 5.
Record the quotient 1 as the next digit in the result. 
Result so far: 1485.91
If we subtract 45 from 50, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 8:
If we divide 50 by 45, we get 1 and a remainder of 5.
The next digit of our result is 1. 
Result so far: 1485.911
If we subtract 45 from 50, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

The final outcome is 1485.911, with a leftover of 0.0005.