768864 divided by 45 
We want to figure out the number of times 768864 can be divided by 45.

On to step 1:
The number 45 fits into 7 0 times, leaving a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Take the next digit (6) from the dividend and append it to 7, then repeat: 76 / 45

Step 2:
45 goes into 76 1 times with a remainder of 31.
The next digit of our result is 1. 
Result so far: 1.0
Subtract 45 from 76 to get 31.
Include the next digit (8) from the dividend after 31, then repeat: 318 / 45

Moving on to step 3:
318 divided by 45 is 7 with a remainder of 3.
Write down 7 as next digit of the result. 
Result so far: 17.0
Subtract 315 from 318 to get 3.
Include the next digit (8) from the dividend after 3, then repeat: 38 / 45

On to step 4:
If we divide 38 by 45, we get 0 and a remainder of 38.
Record the quotient 0 as the next digit in the result. 
Result so far: 170.0
Subtract 0 from 38 to get 38.
Include the next digit (6) from the dividend after 38, then repeat: 386 / 45

Going ahead to step 5:
386 divided by 45 is 8 with a remainder of 26.
Write down 8 as next digit of the result. 
Result so far: 1708.0
Deduct 360 from 386 and we're left with 26.
Include the next digit (4) from the dividend after 26, then repeat: 264 / 45

Advancing to step 6:
When dividing 264 by 45, we get 5 with a remainder of 39.
The number 5 becomes the next digit in our result. 
Result so far: 17085.0
Deduct 225 from 264 and we're left with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Moving on to step 7:
45 can be fit into 390 8 times, resulting in a remainder of 30.
The number 8 becomes the next digit in our result. 
Result so far: 17085.8
Subtract 360 from 390 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 8:
If we divide 300 by 45, we get 6 and a remainder of 30.
Write down 6 as next digit of the result. 
Result so far: 17085.86
Subtracting 270 from 300 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Moving on to step 9:
If we divide 300 by 45, we get 6 and a remainder of 30.
The next digit of our result is 6. 
Result so far: 17085.866
The remainder is 30 after subtracting 270 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

The final outcome is 17085.866, with a leftover of 0.003.