Let's divide 2457870 by 644
Our goal is to divide 2457870 by 644.

On to step 1:
644 goes into 2 0 times with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Include the next digit (4) from the dividend after 2, then repeat: 24 / 644

On to step 2:
When dividing 24 by 644, we get 0 with a remainder of 24.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 24, we get 24.
Bring next digit (5) of the dividend behind the 24 and repeat the process: 245 / 644

On to step 3:
If we divide 245 by 644, we get 0 and a remainder of 245.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 245 after subtracting 0 from 245.
Take the next digit (7) from the dividend and append it to 245, then repeat: 2457 / 644

Step 4:
644 goes into 2457 3 times with a remainder of 525.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Deduct 1932 from 2457 and we're left with 525.
Take the next digit (8) from the dividend and append it to 525, then repeat: 5258 / 644

On to step 5:
644 goes into 5258 8 times with a remainder of 106.
The number 8 becomes the next digit in our result. 
Result so far: 38.0
Deduct 5152 from 5258 and we're left with 106.
Include the next digit (7) from the dividend after 106, then repeat: 1067 / 644

Step 6:
The number 644 fits into 1067 1 times, leaving a remainder of 423.
Put 1 as the next digit of the answer. 
Result so far: 381.0
If we subtract 644 from 1067, we get 423.
Include the next digit (0) from the dividend after 423, then repeat: 4230 / 644

Going ahead to step 7:
The number 644 fits into 4230 6 times, leaving a remainder of 366.
The next digit of our result is 6. 
Result so far: 3816.0
The remainder is 366 after subtracting 3864 from 4230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3660, and continue the process.

Moving on to step 8:
When dividing 3660 by 644, we get 5 with a remainder of 440.
Record the quotient 5 as the next digit in the result. 
Result so far: 3816.5
Deduct 3220 from 3660 and we're left with 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4400, and continue the process.

Going ahead to step 9:
When dividing 4400 by 644, we get 6 with a remainder of 536.
Write down 6 as next digit of the result. 
Result so far: 3816.56
If we subtract 3864 from 4400, we get 536.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5360, and continue the process.

Let's proceed to step 10:
The number 644 fits into 5360 8 times, leaving a remainder of 208.
Put 8 as the next digit of the answer. 
Result so far: 3816.568
The remainder is 208 after subtracting 5152 from 5360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2080, and continue the process.

Advancing to step 11:
644 goes into 2080 3 times with a remainder of 148.
Use 3 as the next digit of our solution. 
Result so far: 3816.5683
The remainder is 148 after subtracting 1932 from 2080.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1480, and continue the process.

Moving on to step 12:
The number 644 fits into 1480 2 times, leaving a remainder of 192.
Put 2 as the next digit of the answer. 
Result so far: 3816.56832
The remainder is 192 after subtracting 1288 from 1480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1920, and continue the process.

Let's proceed to step 13:
1920 divided by 644 is 2 with a remainder of 632.
Put 2 as the next digit of the answer. 
Result so far: 3816.568322
If we subtract 1288 from 1920, we get 632.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6320, and continue the process.

After the division, we end up with 3816.568322 and a remainder of 6.32e-05.