30990087 divided by 642 
We want to divide 30990087 by 642.

Going ahead to step 1:
If we divide 3 by 642, we get 0 and a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Append the next digit (0) from the dividend to 3 and continue with: 30 / 642

Advancing to step 2:
30 divided by 642 is 0 with a remainder of 30.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 30 after subtracting 0 from 30.
Bring next digit (9) of the dividend behind the 30 and repeat the process: 309 / 642

Advancing to step 3:
642 goes into 309 0 times with a remainder of 309.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 309, we end up with 309.
Fetch the next digit (9) from the dividend, attach it to 309 and continue: 3099 / 642

On to step 4:
When dividing 3099 by 642, we get 4 with a remainder of 531.
The next digit of our result is 4. 
Result so far: 4.0
If we subtract 2568 from 3099, we get 531.
Include the next digit (0) from the dividend after 531, then repeat: 5310 / 642

Advancing to step 5:
If we divide 5310 by 642, we get 8 and a remainder of 174.
The number 8 becomes the next digit in our result. 
Result so far: 48.0
Subtract 5136 from 5310 to get 174.
Grab the next digit (0) from the dividend, add it to 174, then carry on: 1740 / 642

Step 6:
If we divide 1740 by 642, we get 2 and a remainder of 456.
The next digit of our result is 2. 
Result so far: 482.0
Subtract 1284 from 1740 to get 456.
Append the next digit (8) from the dividend to 456 and continue with: 4568 / 642

Moving on to step 7:
4568 divided by 642 is 7 with a remainder of 74.
The next digit of our result is 7. 
Result so far: 4827.0
Subtracting 4494 from 4568 leaves us with 74.
Include the next digit (7) from the dividend after 74, then repeat: 747 / 642

Step 8:
If we divide 747 by 642, we get 1 and a remainder of 105.
The number 1 becomes the next digit in our result. 
Result so far: 48271.0
If we subtract 642 from 747, we get 105.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1050, and continue the process.

Advancing to step 9:
If we divide 1050 by 642, we get 1 and a remainder of 408.
Record the quotient 1 as the next digit in the result. 
Result so far: 48271.1
If we take 642 away from 1050, we end up with 408.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4080, and continue the process.

Moving on to step 10:
642 can be fit into 4080 6 times, resulting in a remainder of 228.
Put 6 as the next digit of the answer. 
Result so far: 48271.16
Subtract 3852 from 4080 to get 228.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2280, and continue the process.

Let's proceed to step 11:
642 can be fit into 2280 3 times, resulting in a remainder of 354.
The number 3 becomes the next digit in our result. 
Result so far: 48271.163
Subtracting 1926 from 2280 leaves us with 354.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3540, and continue the process.

Moving on to step 12:
3540 divided by 642 is 5 with a remainder of 330.
Use 5 as the next digit of our solution. 
Result so far: 48271.1635
Subtracting 3210 from 3540 leaves us with 330.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3300, and continue the process.

Step 13:
When dividing 3300 by 642, we get 5 with a remainder of 90.
Write down 5 as next digit of the result. 
Result so far: 48271.16355
Deduct 3210 from 3300 and we're left with 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Our division results in 48271.16355 with a remaining 9e-05.