We look at the division of 938940 by 51 
Let's see how many times 51 fits into 938940.

On to step 1:
If we divide 9 by 51, we get 0 and a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Grab the next digit (3) from the dividend, add it to 9, then carry on: 93 / 51

Let's proceed to step 2:
51 goes into 93 1 times with a remainder of 42.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 51 away from 93, we end up with 42.
Append the next digit (8) from the dividend to 42 and continue with: 428 / 51

Advancing to step 3:
428 divided by 51 is 8 with a remainder of 20.
The number 8 becomes the next digit in our result. 
Result so far: 18.0
Subtracting 408 from 428 leaves us with 20.
Include the next digit (9) from the dividend after 20, then repeat: 209 / 51

Step 4:
When dividing 209 by 51, we get 4 with a remainder of 5.
Write down 4 as next digit of the result. 
Result so far: 184.0
Deduct 204 from 209 and we're left with 5.
Grab the next digit (4) from the dividend, add it to 5, then carry on: 54 / 51

Step 5:
If we divide 54 by 51, we get 1 and a remainder of 3.
Record the quotient 1 as the next digit in the result. 
Result so far: 1841.0
Subtract 51 from 54 to get 3.
Grab the next digit (0) from the dividend, add it to 3, then carry on: 30 / 51

Step 6:
If we divide 30 by 51, we get 0 and a remainder of 30.
Put 0 as the next digit of the answer. 
Result so far: 18410.0
Subtract 0 from 30 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Moving on to step 7:
300 divided by 51 is 5 with a remainder of 45.
The next digit of our result is 5. 
Result so far: 18410.5
If we take 255 away from 300, we end up with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Advancing to step 8:
When dividing 450 by 51, we get 8 with a remainder of 42.
The next digit of our result is 8. 
Result so far: 18410.58
If we take 408 away from 450, we end up with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

On to step 9:
51 can be fit into 420 8 times, resulting in a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 18410.588
Subtract 408 from 420 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

After the division, we end up with 18410.588 and a remainder of 0.0012.