We look at the division of 79820146 by 642 
Let's see how many times 642 fits into 79820146.

Going ahead to step 1:
If we divide 7 by 642, we get 0 and a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Include the next digit (9) from the dividend after 7, then repeat: 79 / 642

Going ahead to step 2:
79 divided by 642 is 0 with a remainder of 79.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 79 and we're left with 79.
Include the next digit (8) from the dividend after 79, then repeat: 798 / 642

Moving on to step 3:
642 can be fit into 798 1 times, resulting in a remainder of 156.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 156 after subtracting 642 from 798.
Take the next digit (2) from the dividend and append it to 156, then repeat: 1562 / 642

Going ahead to step 4:
When dividing 1562 by 642, we get 2 with a remainder of 278.
The number 2 becomes the next digit in our result. 
Result so far: 12.0
Subtract 1284 from 1562 to get 278.
Append the next digit (0) from the dividend to 278 and continue with: 2780 / 642

Advancing to step 5:
When dividing 2780 by 642, we get 4 with a remainder of 212.
Use 4 as the next digit of our solution. 
Result so far: 124.0
If we subtract 2568 from 2780, we get 212.
Fetch the next digit (1) from the dividend, attach it to 212 and continue: 2121 / 642

Advancing to step 6:
If we divide 2121 by 642, we get 3 and a remainder of 195.
The number 3 becomes the next digit in our result. 
Result so far: 1243.0
If we take 1926 away from 2121, we end up with 195.
Append the next digit (4) from the dividend to 195 and continue with: 1954 / 642

Step 7:
1954 divided by 642 is 3 with a remainder of 28.
Record the quotient 3 as the next digit in the result. 
Result so far: 12433.0
If we subtract 1926 from 1954, we get 28.
Bring next digit (6) of the dividend behind the 28 and repeat the process: 286 / 642

Going ahead to step 8:
286 divided by 642 is 0 with a remainder of 286.
Use 0 as the next digit of our solution. 
Result so far: 124330.0
Subtracting 0 from 286 leaves us with 286.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2860, and continue the process.

Step 9:
2860 divided by 642 is 4 with a remainder of 292.
Put 4 as the next digit of the answer. 
Result so far: 124330.4
If we take 2568 away from 2860, we end up with 292.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2920, and continue the process.

Advancing to step 10:
If we divide 2920 by 642, we get 4 and a remainder of 352.
Record the quotient 4 as the next digit in the result. 
Result so far: 124330.44
Subtracting 2568 from 2920 leaves us with 352.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3520, and continue the process.

After the division, we end up with 124330.44 and a remainder of 0.352.