639154 divided by 45 
Our goal is to divide 639154 by 45.

Let's proceed to step 1:
6 divided by 45 is 0 with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Append the next digit (3) from the dividend to 6 and continue with: 63 / 45

On to step 2:
45 goes into 63 1 times with a remainder of 18.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtracting 45 from 63 leaves us with 18.
Take the next digit (9) from the dividend and append it to 18, then repeat: 189 / 45

On to step 3:
45 can be fit into 189 4 times, resulting in a remainder of 9.
The number 4 becomes the next digit in our result. 
Result so far: 14.0
Deduct 180 from 189 and we're left with 9.
Take the next digit (1) from the dividend and append it to 9, then repeat: 91 / 45

On to step 4:
When dividing 91 by 45, we get 2 with a remainder of 1.
Use 2 as the next digit of our solution. 
Result so far: 142.0
The remainder is 1 after subtracting 90 from 91.
Include the next digit (5) from the dividend after 1, then repeat: 15 / 45

Let's proceed to step 5:
The number 45 fits into 15 0 times, leaving a remainder of 15.
Write down 0 as next digit of the result. 
Result so far: 1420.0
If we take 0 away from 15, we end up with 15.
Grab the next digit (4) from the dividend, add it to 15, then carry on: 154 / 45

Step 6:
If we divide 154 by 45, we get 3 and a remainder of 19.
Record the quotient 3 as the next digit in the result. 
Result so far: 14203.0
If we take 135 away from 154, we end up with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

On to step 7:
190 divided by 45 is 4 with a remainder of 10.
Record the quotient 4 as the next digit in the result. 
Result so far: 14203.4
Subtract 180 from 190 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 8:
45 can be fit into 100 2 times, resulting in a remainder of 10.
Write down 2 as next digit of the result. 
Result so far: 14203.42
The remainder is 10 after subtracting 90 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 9:
100 divided by 45 is 2 with a remainder of 10.
The next digit of our result is 2. 
Result so far: 14203.422
Deduct 90 from 100 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

After the division, we end up with 14203.422 and a remainder of 0.001.