We're dividing 646112 by 45 
Let's see how many times 45 fits into 646112.

On to step 1:
45 can be fit into 6 0 times, resulting in a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Include the next digit (4) from the dividend after 6, then repeat: 64 / 45

Advancing to step 2:
If we divide 64 by 45, we get 1 and a remainder of 19.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 45 from 64 leaves us with 19.
Take the next digit (6) from the dividend and append it to 19, then repeat: 196 / 45

Moving on to step 3:
When dividing 196 by 45, we get 4 with a remainder of 16.
Record the quotient 4 as the next digit in the result. 
Result so far: 14.0
If we subtract 180 from 196, we get 16.
Grab the next digit (1) from the dividend, add it to 16, then carry on: 161 / 45

Advancing to step 4:
When dividing 161 by 45, we get 3 with a remainder of 26.
Write down 3 as next digit of the result. 
Result so far: 143.0
Subtract 135 from 161 to get 26.
Include the next digit (1) from the dividend after 26, then repeat: 261 / 45

Advancing to step 5:
261 divided by 45 is 5 with a remainder of 36.
The number 5 becomes the next digit in our result. 
Result so far: 1435.0
If we take 225 away from 261, we end up with 36.
Bring next digit (2) of the dividend behind the 36 and repeat the process: 362 / 45

Step 6:
The number 45 fits into 362 8 times, leaving a remainder of 2.
The next digit of our result is 8. 
Result so far: 14358.0
If we subtract 360 from 362, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 7:
45 goes into 20 0 times with a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 14358.0
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 8:
200 divided by 45 is 4 with a remainder of 20.
The number 4 becomes the next digit in our result. 
Result so far: 14358.04
Subtract 180 from 200 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 9:
45 can be fit into 200 4 times, resulting in a remainder of 20.
Record the quotient 4 as the next digit in the result. 
Result so far: 14358.044
Deduct 180 from 200 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

The quotient of the division is 14358.044, and the remainder is 0.002.