12421289 divided by 723 
We want to figure out the number of times 12421289 can be divided by 723.

On to step 1:
1 divided by 723 is 0 with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Fetch the next digit (2) from the dividend, attach it to 1 and continue: 12 / 723

Let's proceed to step 2:
723 goes into 12 0 times with a remainder of 12.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 12, we end up with 12.
Include the next digit (4) from the dividend after 12, then repeat: 124 / 723

Moving on to step 3:
723 can be fit into 124 0 times, resulting in a remainder of 124.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 124 to get 124.
Bring next digit (2) of the dividend behind the 124 and repeat the process: 1242 / 723

On to step 4:
723 can be fit into 1242 1 times, resulting in a remainder of 519.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtracting 723 from 1242 leaves us with 519.
Take the next digit (1) from the dividend and append it to 519, then repeat: 5191 / 723

Advancing to step 5:
5191 divided by 723 is 7 with a remainder of 130.
Write down 7 as next digit of the result. 
Result so far: 17.0
Deduct 5061 from 5191 and we're left with 130.
Append the next digit (2) from the dividend to 130 and continue with: 1302 / 723

Advancing to step 6:
When dividing 1302 by 723, we get 1 with a remainder of 579.
Use 1 as the next digit of our solution. 
Result so far: 171.0
If we subtract 723 from 1302, we get 579.
Fetch the next digit (8) from the dividend, attach it to 579 and continue: 5798 / 723

Going ahead to step 7:
723 can be fit into 5798 8 times, resulting in a remainder of 14.
The next digit of our result is 8. 
Result so far: 1718.0
Deduct 5784 from 5798 and we're left with 14.
Grab the next digit (9) from the dividend, add it to 14, then carry on: 149 / 723

Let's proceed to step 8:
723 can be fit into 149 0 times, resulting in a remainder of 149.
The number 0 becomes the next digit in our result. 
Result so far: 17180.0
If we subtract 0 from 149, we get 149.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1490, and continue the process.

On to step 9:
When dividing 1490 by 723, we get 2 with a remainder of 44.
Put 2 as the next digit of the answer. 
Result so far: 17180.2
The remainder is 44 after subtracting 1446 from 1490.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Advancing to step 10:
If we divide 440 by 723, we get 0 and a remainder of 440.
Record the quotient 0 as the next digit in the result. 
Result so far: 17180.2
The remainder is 440 after subtracting 0 from 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4400, and continue the process.

Step 11:
4400 divided by 723 is 6 with a remainder of 62.
Record the quotient 6 as the next digit in the result. 
Result so far: 17180.206
Subtracting 4338 from 4400 leaves us with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Let's proceed to step 12:
723 goes into 620 0 times with a remainder of 620.
Put 0 as the next digit of the answer. 
Result so far: 17180.206
The remainder is 620 after subtracting 0 from 620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6200, and continue the process.

Step 13:
The number 723 fits into 6200 8 times, leaving a remainder of 416.
Write down 8 as next digit of the result. 
Result so far: 17180.20608
If we take 5784 away from 6200, we end up with 416.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4160, and continue the process.

Let's proceed to step 14:
4160 divided by 723 is 5 with a remainder of 545.
Use 5 as the next digit of our solution. 
Result so far: 17180.206085
If we subtract 3615 from 4160, we get 545.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5450, and continue the process.

Going ahead to step 15:
723 can be fit into 5450 7 times, resulting in a remainder of 389.
Put 7 as the next digit of the answer. 
Result so far: 17180.2060857
Subtracting 5061 from 5450 leaves us with 389.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3890, and continue the process.

Let's proceed to step 16:
723 can be fit into 3890 5 times, resulting in a remainder of 275.
Use 5 as the next digit of our solution. 
Result so far: 17180.20608575
If we take 3615 away from 3890, we end up with 275.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2750, and continue the process.

Our division results in 17180.20608575 with a remaining 2.75e-07.