51279943 divided by 378 
We're looking to find how many times 378 goes into 51279943.

Going ahead to step 1:
If we divide 5 by 378, we get 0 and a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Grab the next digit (1) from the dividend, add it to 5, then carry on: 51 / 378

Step 2:
The number 378 fits into 51 0 times, leaving a remainder of 51.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 51 to get 51.
Bring next digit (2) of the dividend behind the 51 and repeat the process: 512 / 378

Let's proceed to step 3:
378 can be fit into 512 1 times, resulting in a remainder of 134.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 378 from 512 to get 134.
Grab the next digit (7) from the dividend, add it to 134, then carry on: 1347 / 378

Step 4:
The number 378 fits into 1347 3 times, leaving a remainder of 213.
Record the quotient 3 as the next digit in the result. 
Result so far: 13.0
Deduct 1134 from 1347 and we're left with 213.
Fetch the next digit (9) from the dividend, attach it to 213 and continue: 2139 / 378

Step 5:
2139 divided by 378 is 5 with a remainder of 249.
Use 5 as the next digit of our solution. 
Result so far: 135.0
If we take 1890 away from 2139, we end up with 249.
Bring next digit (9) of the dividend behind the 249 and repeat the process: 2499 / 378

On to step 6:
2499 divided by 378 is 6 with a remainder of 231.
Write down 6 as next digit of the result. 
Result so far: 1356.0
If we take 2268 away from 2499, we end up with 231.
Append the next digit (4) from the dividend to 231 and continue with: 2314 / 378

On to step 7:
The number 378 fits into 2314 6 times, leaving a remainder of 46.
The next digit of our result is 6. 
Result so far: 13566.0
If we take 2268 away from 2314, we end up with 46.
Append the next digit (3) from the dividend to 46 and continue with: 463 / 378

Step 8:
378 can be fit into 463 1 times, resulting in a remainder of 85.
The next digit of our result is 1. 
Result so far: 135661.0
Subtract 378 from 463 to get 85.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

Step 9:
850 divided by 378 is 2 with a remainder of 94.
Put 2 as the next digit of the answer. 
Result so far: 135661.2
The remainder is 94 after subtracting 756 from 850.
Since there are no more digits in the dividend, we add a zero to the remainder making it 940, and continue the process.

Step 10:
If we divide 940 by 378, we get 2 and a remainder of 184.
The number 2 becomes the next digit in our result. 
Result so far: 135661.22
If we take 756 away from 940, we end up with 184.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1840, and continue the process.

The final result is 135661.22 with a remainder of 0.184.