Let's divide 71239251 by 878
We want to figure out the number of times 71239251 can be divided by 878.

Step 1:
The number 878 fits into 7 0 times, leaving a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Grab the next digit (1) from the dividend, add it to 7, then carry on: 71 / 878

On to step 2:
If we divide 71 by 878, we get 0 and a remainder of 71.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 71 after subtracting 0 from 71.
Take the next digit (2) from the dividend and append it to 71, then repeat: 712 / 878

On to step 3:
878 can be fit into 712 0 times, resulting in a remainder of 712.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 712, we get 712.
Append the next digit (3) from the dividend to 712 and continue with: 7123 / 878

Advancing to step 4:
If we divide 7123 by 878, we get 8 and a remainder of 99.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
Deduct 7024 from 7123 and we're left with 99.
Grab the next digit (9) from the dividend, add it to 99, then carry on: 999 / 878

On to step 5:
878 can be fit into 999 1 times, resulting in a remainder of 121.
The next digit of our result is 1. 
Result so far: 81.0
Deduct 878 from 999 and we're left with 121.
Fetch the next digit (2) from the dividend, attach it to 121 and continue: 1212 / 878

Advancing to step 6:
The number 878 fits into 1212 1 times, leaving a remainder of 334.
Use 1 as the next digit of our solution. 
Result so far: 811.0
If we take 878 away from 1212, we end up with 334.
Take the next digit (5) from the dividend and append it to 334, then repeat: 3345 / 878

Going ahead to step 7:
If we divide 3345 by 878, we get 3 and a remainder of 711.
Put 3 as the next digit of the answer. 
Result so far: 8113.0
If we subtract 2634 from 3345, we get 711.
Append the next digit (1) from the dividend to 711 and continue with: 7111 / 878

Let's proceed to step 8:
The number 878 fits into 7111 8 times, leaving a remainder of 87.
The number 8 becomes the next digit in our result. 
Result so far: 81138.0
Deduct 7024 from 7111 and we're left with 87.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

Let's proceed to step 9:
When dividing 870 by 878, we get 0 with a remainder of 870.
Put 0 as the next digit of the answer. 
Result so far: 81138.0
Subtracting 0 from 870 leaves us with 870.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8700, and continue the process.

On to step 10:
878 can be fit into 8700 9 times, resulting in a remainder of 798.
The next digit of our result is 9. 
Result so far: 81138.09
Subtract 7902 from 8700 to get 798.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7980, and continue the process.

Advancing to step 11:
878 can be fit into 7980 9 times, resulting in a remainder of 78.
Write down 9 as next digit of the result. 
Result so far: 81138.099
Subtracting 7902 from 7980 leaves us with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

The quotient of the division is 81138.099, and the remainder is 0.0078.