Let's divide 63878791 by 400
We want to figure out the number of times 63878791 can be divided by 400.

Moving on to step 1:
If we divide 6 by 400, we get 0 and a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Bring next digit (3) of the dividend behind the 6 and repeat the process: 63 / 400

Moving on to step 2:
The number 400 fits into 63 0 times, leaving a remainder of 63.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 63 leaves us with 63.
Take the next digit (8) from the dividend and append it to 63, then repeat: 638 / 400

Going ahead to step 3:
If we divide 638 by 400, we get 1 and a remainder of 238.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 400 from 638 and we're left with 238.
Take the next digit (7) from the dividend and append it to 238, then repeat: 2387 / 400

Let's proceed to step 4:
2387 divided by 400 is 5 with a remainder of 387.
Use 5 as the next digit of our solution. 
Result so far: 15.0
If we subtract 2000 from 2387, we get 387.
Bring next digit (8) of the dividend behind the 387 and repeat the process: 3878 / 400

On to step 5:
3878 divided by 400 is 9 with a remainder of 278.
Record the quotient 9 as the next digit in the result. 
Result so far: 159.0
If we subtract 3600 from 3878, we get 278.
Grab the next digit (7) from the dividend, add it to 278, then carry on: 2787 / 400

Step 6:
400 can be fit into 2787 6 times, resulting in a remainder of 387.
Record the quotient 6 as the next digit in the result. 
Result so far: 1596.0
The remainder is 387 after subtracting 2400 from 2787.
Include the next digit (9) from the dividend after 387, then repeat: 3879 / 400

Going ahead to step 7:
When dividing 3879 by 400, we get 9 with a remainder of 279.
Put 9 as the next digit of the answer. 
Result so far: 15969.0
The remainder is 279 after subtracting 3600 from 3879.
Take the next digit (1) from the dividend and append it to 279, then repeat: 2791 / 400

On to step 8:
400 can be fit into 2791 6 times, resulting in a remainder of 391.
Write down 6 as next digit of the result. 
Result so far: 159696.0
Subtract 2400 from 2791 to get 391.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3910, and continue the process.

Going ahead to step 9:
If we divide 3910 by 400, we get 9 and a remainder of 310.
Use 9 as the next digit of our solution. 
Result so far: 159696.9
If we take 3600 away from 3910, we end up with 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3100, and continue the process.

Step 10:
The number 400 fits into 3100 7 times, leaving a remainder of 300.
Use 7 as the next digit of our solution. 
Result so far: 159696.97
The remainder is 300 after subtracting 2800 from 3100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Going ahead to step 11:
The number 400 fits into 3000 7 times, leaving a remainder of 200.
The next digit of our result is 7. 
Result so far: 159696.977
Subtract 2800 from 3000 to get 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

The final result is 159696.977 with a remainder of 0.02.