640149 ÷ 4 
We're looking to find how many times 4 goes into 640149.

Let's proceed to step 1:
4 goes into 6 1 times with a remainder of 2.
The next digit of our result is 1. 
Result so far: 1.0
If we take 4 away from 6, we end up with 2.
Fetch the next digit (4) from the dividend, attach it to 2 and continue: 24 / 4

Step 2:
4 goes into 24 6 times with a remainder of 0.
The next digit of our result is 6. 
Result so far: 16.0
If we subtract 24 from 24, we get 0.
Grab the next digit (0) from the dividend, add it to 0, then carry on: 0 / 4

Step 3:
4 goes into 0 0 times with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 160.0
If we subtract 0 from 0, we get 0.
Take the next digit (1) from the dividend and append it to 0, then repeat: 1 / 4

Going ahead to step 4:
When dividing 1 by 4, we get 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 1600.0
The remainder is 1 after subtracting 0 from 1.
Bring next digit (4) of the dividend behind the 1 and repeat the process: 14 / 4

On to step 5:
When dividing 14 by 4, we get 3 with a remainder of 2.
Record the quotient 3 as the next digit in the result. 
Result so far: 16003.0
Deduct 12 from 14 and we're left with 2.
Fetch the next digit (9) from the dividend, attach it to 2 and continue: 29 / 4

Step 6:
When dividing 29 by 4, we get 7 with a remainder of 1.
The next digit of our result is 7. 
Result so far: 160037.0
The remainder is 1 after subtracting 28 from 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 7:
The number 4 fits into 10 2 times, leaving a remainder of 2.
Record the quotient 2 as the next digit in the result. 
Result so far: 160037.2
Subtract 8 from 10 to 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.

Advancing to step 8:
20 divided by 4 is 5 with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 160037.25
Subtracting 20 from 20 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 9:
If we divide 0 by 4, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 160037.25
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 10:
The number 4 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 160037.25
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

In conclusion, the division gives 160037.25 with a balance of 0.0.