1644951 ÷ 422 
Let's see how many times 422 fits into 1644951.

Step 1:
1 divided by 422 is 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Bring next digit (6) of the dividend behind the 1 and repeat the process: 16 / 422

Step 2:
The number 422 fits into 16 0 times, leaving a remainder of 16.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 16 after subtracting 0 from 16.
Fetch the next digit (4) from the dividend, attach it to 16 and continue: 164 / 422

Let's proceed to step 3:
422 goes into 164 0 times with a remainder of 164.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 164, we end up with 164.
Grab the next digit (4) from the dividend, add it to 164, then carry on: 1644 / 422

Let's proceed to step 4:
1644 divided by 422 is 3 with a remainder of 378.
Write down 3 as next digit of the result. 
Result so far: 3.0
If we subtract 1266 from 1644, we get 378.
Include the next digit (9) from the dividend after 378, then repeat: 3789 / 422

Moving on to step 5:
422 goes into 3789 8 times with a remainder of 413.
Use 8 as the next digit of our solution. 
Result so far: 38.0
The remainder is 413 after subtracting 3376 from 3789.
Include the next digit (5) from the dividend after 413, then repeat: 4135 / 422

Going ahead to step 6:
The number 422 fits into 4135 9 times, leaving a remainder of 337.
Use 9 as the next digit of our solution. 
Result so far: 389.0
If we take 3798 away from 4135, we end up with 337.
Include the next digit (1) from the dividend after 337, then repeat: 3371 / 422

Advancing to step 7:
The number 422 fits into 3371 7 times, leaving a remainder of 417.
The next digit of our result is 7. 
Result so far: 3897.0
The remainder is 417 after subtracting 2954 from 3371.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4170, and continue the process.

On to step 8:
422 goes into 4170 9 times with a remainder of 372.
The next digit of our result is 9. 
Result so far: 3897.9
Subtract 3798 from 4170 to get 372.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3720, and continue the process.

Step 9:
When dividing 3720 by 422, we get 8 with a remainder of 344.
Record the quotient 8 as the next digit in the result. 
Result so far: 3897.98
If we take 3376 away from 3720, we end up with 344.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3440, and continue the process.

Let's proceed to step 10:
422 can be fit into 3440 8 times, resulting in a remainder of 64.
Put 8 as the next digit of the answer. 
Result so far: 3897.988
Subtracting 3376 from 3440 leaves us with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

The final outcome is 3897.988, with a leftover of 0.0064.