12378001 ÷ 264 
Let's see how many times 264 fits into 12378001.

On to step 1:
264 goes into 1 0 times with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Grab the next digit (2) from the dividend, add it to 1, then carry on: 12 / 264

Going ahead to step 2:
264 goes into 12 0 times with a remainder of 12.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 12, we end up with 12.
Bring next digit (3) of the dividend behind the 12 and repeat the process: 123 / 264

Going ahead to step 3:
264 goes into 123 0 times with a remainder of 123.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 123, we end up with 123.
Append the next digit (7) from the dividend to 123 and continue with: 1237 / 264

Advancing to step 4:
264 goes into 1237 4 times with a remainder of 181.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
Subtract 1056 from 1237 to get 181.
Grab the next digit (8) from the dividend, add it to 181, then carry on: 1818 / 264

Moving on to step 5:
264 can be fit into 1818 6 times, resulting in a remainder of 234.
The number 6 becomes the next digit in our result. 
Result so far: 46.0
The remainder is 234 after subtracting 1584 from 1818.
Append the next digit (0) from the dividend to 234 and continue with: 2340 / 264

Let's proceed to step 6:
If we divide 2340 by 264, we get 8 and a remainder of 228.
Put 8 as the next digit of the answer. 
Result so far: 468.0
Deduct 2112 from 2340 and we're left with 228.
Bring next digit (0) of the dividend behind the 228 and repeat the process: 2280 / 264

Moving on to step 7:
When dividing 2280 by 264, we get 8 with a remainder of 168.
Record the quotient 8 as the next digit in the result. 
Result so far: 4688.0
If we subtract 2112 from 2280, we get 168.
Fetch the next digit (1) from the dividend, attach it to 168 and continue: 1681 / 264

On to step 8:
If we divide 1681 by 264, we get 6 and a remainder of 97.
Record the quotient 6 as the next digit in the result. 
Result so far: 46886.0
If we take 1584 away from 1681, we end up with 97.
Since there are no more digits in the dividend, we add a zero to the remainder making it 970, and continue the process.

Going ahead to step 9:
When dividing 970 by 264, we get 3 with a remainder of 178.
The number 3 becomes the next digit in our result. 
Result so far: 46886.3
If we take 792 away from 970, we end up with 178.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1780, and continue the process.

Advancing to step 10:
If we divide 1780 by 264, we get 6 and a remainder of 196.
Record the quotient 6 as the next digit in the result. 
Result so far: 46886.36
Subtract 1584 from 1780 to get 196.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1960, and continue the process.

Moving on to step 11:
The number 264 fits into 1960 7 times, leaving a remainder of 112.
The next digit of our result is 7. 
Result so far: 46886.367
Deduct 1848 from 1960 and we're left with 112.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1120, and continue the process.

Going ahead to step 12:
When dividing 1120 by 264, we get 4 with a remainder of 64.
The next digit of our result is 4. 
Result so far: 46886.3674
Subtract 1056 from 1120 to get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Advancing to step 13:
If we divide 640 by 264, we get 2 and a remainder of 112.
Use 2 as the next digit of our solution. 
Result so far: 46886.36742
If we take 528 away from 640, we end up with 112.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1120, and continue the process.

Moving on to step 14:
The number 264 fits into 1120 4 times, leaving a remainder of 64.
Record the quotient 4 as the next digit in the result. 
Result so far: 46886.367424
If we take 1056 away from 1120, we end up with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

On to step 15:
264 goes into 640 2 times with a remainder of 112.
Record the quotient 2 as the next digit in the result. 
Result so far: 46886.3674242
If we take 528 away from 640, we end up with 112.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1120, and continue the process.

Step 16:
264 goes into 1120 4 times with a remainder of 64.
Write down 4 as next digit of the result. 
Result so far: 46886.36742424
If we subtract 1056 from 1120, we get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

The final outcome is 46886.36742424, with a leftover of 6.4e-08.