639454 ÷ 45 
We want to divide 639454 by 45.

Step 1:
The number 45 fits into 6 0 times, leaving a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Grab the next digit (3) from the dividend, add it to 6, then carry on: 63 / 45

On to step 2:
45 can be fit into 63 1 times, resulting in a remainder of 18.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we take 45 away from 63, we end up with 18.
Include the next digit (9) from the dividend after 18, then repeat: 189 / 45

Going ahead to step 3:
45 can be fit into 189 4 times, resulting in a remainder of 9.
Write down 4 as next digit of the result. 
Result so far: 14.0
Subtracting 180 from 189 leaves us with 9.
Append the next digit (4) from the dividend to 9 and continue with: 94 / 45

Step 4:
45 goes into 94 2 times with a remainder of 4.
Put 2 as the next digit of the answer. 
Result so far: 142.0
Subtracting 90 from 94 leaves us with 4.
Include the next digit (5) from the dividend after 4, then repeat: 45 / 45

On to step 5:
45 can be fit into 45 1 times, resulting in a remainder of 0.
The number 1 becomes the next digit in our result. 
Result so far: 1421.0
If we take 45 away from 45, we end up with 0.
Grab the next digit (4) from the dividend, add it to 0, then carry on: 4 / 45

Moving on to step 6:
When dividing 4 by 45, we get 0 with a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 14210.0
Subtract 0 from 4 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 7:
When dividing 40 by 45, we get 0 with a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 14210.0
Subtract 0 from 40 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 8:
45 goes into 400 8 times with a remainder of 40.
The number 8 becomes the next digit in our result. 
Result so far: 14210.08
Deduct 360 from 400 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 9:
400 divided by 45 is 8 with a remainder of 40.
Use 8 as the next digit of our solution. 
Result so far: 14210.088
The remainder is 40 after subtracting 360 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Our division results in 14210.088 with a remaining 0.004.