23991310 ÷ 402 
We're looking to find how many times 402 goes into 23991310.

Let's proceed to step 1:
402 can be fit into 2 0 times, resulting in a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Include the next digit (3) from the dividend after 2, then repeat: 23 / 402

Advancing to step 2:
The number 402 fits into 23 0 times, leaving a remainder of 23.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 23, we get 23.
Take the next digit (9) from the dividend and append it to 23, then repeat: 239 / 402

Going ahead to step 3:
239 divided by 402 is 0 with a remainder of 239.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 239, we get 239.
Include the next digit (9) from the dividend after 239, then repeat: 2399 / 402

Let's proceed to step 4:
402 goes into 2399 5 times with a remainder of 389.
Put 5 as the next digit of the answer. 
Result so far: 5.0
If we subtract 2010 from 2399, we get 389.
Bring next digit (1) of the dividend behind the 389 and repeat the process: 3891 / 402

On to step 5:
When dividing 3891 by 402, we get 9 with a remainder of 273.
The number 9 becomes the next digit in our result. 
Result so far: 59.0
If we subtract 3618 from 3891, we get 273.
Append the next digit (3) from the dividend to 273 and continue with: 2733 / 402

Advancing to step 6:
If we divide 2733 by 402, we get 6 and a remainder of 321.
Use 6 as the next digit of our solution. 
Result so far: 596.0
The remainder is 321 after subtracting 2412 from 2733.
Take the next digit (1) from the dividend and append it to 321, then repeat: 3211 / 402

Step 7:
If we divide 3211 by 402, we get 7 and a remainder of 397.
The number 7 becomes the next digit in our result. 
Result so far: 5967.0
Subtracting 2814 from 3211 leaves us with 397.
Take the next digit (0) from the dividend and append it to 397, then repeat: 3970 / 402

Moving on to step 8:
If we divide 3970 by 402, we get 9 and a remainder of 352.
The number 9 becomes the next digit in our result. 
Result so far: 59679.0
If we subtract 3618 from 3970, we get 352.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3520, and continue the process.

Let's proceed to step 9:
If we divide 3520 by 402, we get 8 and a remainder of 304.
Write down 8 as next digit of the result. 
Result so far: 59679.8
If we take 3216 away from 3520, we end up with 304.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3040, and continue the process.

On to step 10:
If we divide 3040 by 402, we get 7 and a remainder of 226.
Put 7 as the next digit of the answer. 
Result so far: 59679.87
Deduct 2814 from 3040 and we're left with 226.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2260, and continue the process.

On to step 11:
402 goes into 2260 5 times with a remainder of 250.
Record the quotient 5 as the next digit in the result. 
Result so far: 59679.875
Deduct 2010 from 2260 and we're left with 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2500, and continue the process.

Moving on to step 12:
When dividing 2500 by 402, we get 6 with a remainder of 88.
Write down 6 as next digit of the result. 
Result so far: 59679.8756
The remainder is 88 after subtracting 2412 from 2500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Advancing to step 13:
When dividing 880 by 402, we get 2 with a remainder of 76.
Put 2 as the next digit of the answer. 
Result so far: 59679.87562
The remainder is 76 after subtracting 804 from 880.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Moving on to step 14:
If we divide 760 by 402, we get 1 and a remainder of 358.
Put 1 as the next digit of the answer. 
Result so far: 59679.875621
Subtract 402 from 760 to get 358.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3580, and continue the process.

Let's proceed to step 15:
When dividing 3580 by 402, we get 8 with a remainder of 364.
Record the quotient 8 as the next digit in the result. 
Result so far: 59679.8756218
If we subtract 3216 from 3580, we get 364.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3640, and continue the process.

Moving on to step 16:
If we divide 3640 by 402, we get 9 and a remainder of 22.
Record the quotient 9 as the next digit in the result. 
Result so far: 59679.87562189
Subtract 3618 from 3640 to get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

The quotient of the division is 59679.87562189, and the remainder is 2.2e-08.