We look at the division of 644864 by 42 
We want to figure out the number of times 644864 can be divided by 42.

On to step 1:
42 goes into 6 0 times with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 42

Step 2:
If we divide 64 by 42, we get 1 and a remainder of 22.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 22 after subtracting 42 from 64.
Take the next digit (4) from the dividend and append it to 22, then repeat: 224 / 42

Moving on to step 3:
The number 42 fits into 224 5 times, leaving a remainder of 14.
The next digit of our result is 5. 
Result so far: 15.0
If we take 210 away from 224, we end up with 14.
Include the next digit (8) from the dividend after 14, then repeat: 148 / 42

On to step 4:
148 divided by 42 is 3 with a remainder of 22.
The next digit of our result is 3. 
Result so far: 153.0
If we subtract 126 from 148, we get 22.
Append the next digit (6) from the dividend to 22 and continue with: 226 / 42

Step 5:
42 goes into 226 5 times with a remainder of 16.
The next digit of our result is 5. 
Result so far: 1535.0
Subtracting 210 from 226 leaves us with 16.
Grab the next digit (4) from the dividend, add it to 16, then carry on: 164 / 42

Let's proceed to step 6:
If we divide 164 by 42, we get 3 and a remainder of 38.
The number 3 becomes the next digit in our result. 
Result so far: 15353.0
If we take 126 away from 164, we end up with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Advancing to step 7:
The number 42 fits into 380 9 times, leaving a remainder of 2.
Write down 9 as next digit of the result. 
Result so far: 15353.9
Subtract 378 from 380 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:
42 can be fit into 20 0 times, resulting in a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 15353.9
If we subtract 0 from 20, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 9:
If we divide 200 by 42, we get 4 and a remainder of 32.
Record the quotient 4 as the next digit in the result. 
Result so far: 15353.904
If we take 168 away from 200, we end up with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

On to step 10:
If we divide 320 by 42, we get 7 and a remainder of 26.
The number 7 becomes the next digit in our result. 
Result so far: 15353.9047
If we subtract 294 from 320, we get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Advancing to step 11:
260 divided by 42 is 6 with a remainder of 8.
The next digit of our result is 6. 
Result so far: 15353.90476
Subtract 252 from 260 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 12:
When dividing 80 by 42, we get 1 with a remainder of 38.
The number 1 becomes the next digit in our result. 
Result so far: 15353.904761
If we subtract 42 from 80, we get 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Moving on to step 13:
42 goes into 380 9 times with a remainder of 2.
Record the quotient 9 as the next digit in the result. 
Result so far: 15353.9047619
Subtracting 378 from 380 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 14:
The number 42 fits into 20 0 times, leaving a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 15353.9047619
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

The quotient of the division is 15353.9047619, and the remainder is 2e-08.