251631 ÷ 78 
We want to figure out the number of times 251631 can be divided by 78.

On to step 1:
2 divided by 78 is 0 with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Include the next digit (5) from the dividend after 2, then repeat: 25 / 78

On to step 2:
The number 78 fits into 25 0 times, leaving a remainder of 25.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 25 after subtracting 0 from 25.
Take the next digit (1) from the dividend and append it to 25, then repeat: 251 / 78

Advancing to step 3:
78 can be fit into 251 3 times, resulting in a remainder of 17.
The next digit of our result is 3. 
Result so far: 3.0
The remainder is 17 after subtracting 234 from 251.
Bring next digit (6) of the dividend behind the 17 and repeat the process: 176 / 78

Advancing to step 4:
78 goes into 176 2 times with a remainder of 20.
Record the quotient 2 as the next digit in the result. 
Result so far: 32.0
Deduct 156 from 176 and we're left with 20.
Fetch the next digit (3) from the dividend, attach it to 20 and continue: 203 / 78

Moving on to step 5:
The number 78 fits into 203 2 times, leaving a remainder of 47.
The next digit of our result is 2. 
Result so far: 322.0
Subtracting 156 from 203 leaves us with 47.
Include the next digit (1) from the dividend after 47, then repeat: 471 / 78

Going ahead to step 6:
78 can be fit into 471 6 times, resulting in a remainder of 3.
Put 6 as the next digit of the answer. 
Result so far: 3226.0
Deduct 468 from 471 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 7:
When dividing 30 by 78, we get 0 with a remainder of 30.
The number 0 becomes the next digit in our result. 
Result so far: 3226.0
If we subtract 0 from 30, we 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.

Advancing to step 8:
If we divide 300 by 78, we get 3 and a remainder of 66.
Use 3 as the next digit of our solution. 
Result so far: 3226.03
Subtracting 234 from 300 leaves us with 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Let's proceed to step 9:
If we divide 660 by 78, we get 8 and a remainder of 36.
Record the quotient 8 as the next digit in the result. 
Result so far: 3226.038
Deduct 624 from 660 and we're left with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

On to step 10:
78 goes into 360 4 times with a remainder of 48.
Record the quotient 4 as the next digit in the result. 
Result so far: 3226.0384
If we take 312 away from 360, we end up with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Advancing to step 11:
78 can be fit into 480 6 times, resulting in a remainder of 12.
Put 6 as the next digit of the answer. 
Result so far: 3226.03846
Subtract 468 from 480 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.

Step 12:
78 can be fit into 120 1 times, resulting in a remainder of 42.
Record the quotient 1 as the next digit in the result. 
Result so far: 3226.038461
If we subtract 78 from 120, we get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Advancing to step 13:
78 goes into 420 5 times with a remainder of 30.
Use 5 as the next digit of our solution. 
Result so far: 3226.0384615
Deduct 390 from 420 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 14:
78 goes into 300 3 times with a remainder of 66.
Put 3 as the next digit of the answer. 
Result so far: 3226.03846153
Subtract 234 from 300 to get 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

In conclusion, the division gives 3226.03846153 with a balance of 6.6e-08.