20511260 divided by 642 
Let's see how many times 642 fits into 20511260.

Moving on to step 1:
The number 642 fits into 2 0 times, leaving a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Append the next digit (0) from the dividend to 2 and continue with: 20 / 642

Moving on to step 2:
20 divided by 642 is 0 with a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 20, we end up with 20.
Append the next digit (5) from the dividend to 20 and continue with: 205 / 642

Let's proceed to step 3:
The number 642 fits into 205 0 times, leaving a remainder of 205.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 205, we get 205.
Append the next digit (1) from the dividend to 205 and continue with: 2051 / 642

Going ahead to step 4:
If we divide 2051 by 642, we get 3 and a remainder of 125.
Write down 3 as next digit of the result. 
Result so far: 3.0
Deduct 1926 from 2051 and we're left with 125.
Fetch the next digit (1) from the dividend, attach it to 125 and continue: 1251 / 642

Let's proceed to step 5:
The number 642 fits into 1251 1 times, leaving a remainder of 609.
The number 1 becomes the next digit in our result. 
Result so far: 31.0
If we take 642 away from 1251, we end up with 609.
Include the next digit (2) from the dividend after 609, then repeat: 6092 / 642

Step 6:
If we divide 6092 by 642, we get 9 and a remainder of 314.
Record the quotient 9 as the next digit in the result. 
Result so far: 319.0
Deduct 5778 from 6092 and we're left with 314.
Fetch the next digit (6) from the dividend, attach it to 314 and continue: 3146 / 642

Moving on to step 7:
If we divide 3146 by 642, we get 4 and a remainder of 578.
Record the quotient 4 as the next digit in the result. 
Result so far: 3194.0
The remainder is 578 after subtracting 2568 from 3146.
Fetch the next digit (0) from the dividend, attach it to 578 and continue: 5780 / 642

Going ahead to step 8:
5780 divided by 642 is 9 with a remainder of 2.
Use 9 as the next digit of our solution. 
Result so far: 31949.0
If we subtract 5778 from 5780, we 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.

Let's proceed to step 9:
If we divide 20 by 642, we get 0 and a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 31949.0
The remainder is 20 after subtracting 0 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 10:
If we divide 200 by 642, we get 0 and a remainder of 200.
Use 0 as the next digit of our solution. 
Result so far: 31949.0
Deduct 0 from 200 and we're left with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

After the division, we end up with 31949.0 and a remainder of 0.2.