621582 ÷ 45 
We're looking to find how many times 45 goes into 621582.

Step 1:
45 goes into 6 0 times with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Include the next digit (2) from the dividend after 6, then repeat: 62 / 45

Step 2:
The number 45 fits into 62 1 times, leaving a remainder of 17.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we subtract 45 from 62, we get 17.
Grab the next digit (1) from the dividend, add it to 17, then carry on: 171 / 45

On to step 3:
171 divided by 45 is 3 with a remainder of 36.
The next digit of our result is 3. 
Result so far: 13.0
If we subtract 135 from 171, we get 36.
Include the next digit (5) from the dividend after 36, then repeat: 365 / 45

Going ahead to step 4:
If we divide 365 by 45, we get 8 and a remainder of 5.
The next digit of our result is 8. 
Result so far: 138.0
Deduct 360 from 365 and we're left with 5.
Include the next digit (8) from the dividend after 5, then repeat: 58 / 45

Moving on to step 5:
When dividing 58 by 45, we get 1 with a remainder of 13.
Put 1 as the next digit of the answer. 
Result so far: 1381.0
Deduct 45 from 58 and we're left with 13.
Bring next digit (2) of the dividend behind the 13 and repeat the process: 132 / 45

Moving on to step 6:
45 can be fit into 132 2 times, resulting in a remainder of 42.
Record the quotient 2 as the next digit in the result. 
Result so far: 13812.0
Deduct 90 from 132 and we're left with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Moving on to step 7:
When dividing 420 by 45, we get 9 with a remainder of 15.
The number 9 becomes the next digit in our result. 
Result so far: 13812.9
Subtracting 405 from 420 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 8:
150 divided by 45 is 3 with a remainder of 15.
Put 3 as the next digit of the answer. 
Result so far: 13812.93
If we subtract 135 from 150, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 9:
150 divided by 45 is 3 with a remainder of 15.
The number 3 becomes the next digit in our result. 
Result so far: 13812.933
If we subtract 135 from 150, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

The quotient of the division is 13812.933, and the remainder is 0.0015.