We're dividing 12453187 by 921 
We're looking to find how many times 921 goes into 12453187.

Step 1:
If we divide 1 by 921, we get 0 and a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 921

Advancing to step 2:
The number 921 fits into 12 0 times, leaving a remainder of 12.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 12 leaves us with 12.
Grab the next digit (4) from the dividend, add it to 12, then carry on: 124 / 921

On to step 3:
921 can be fit into 124 0 times, resulting in a remainder of 124.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 124 after subtracting 0 from 124.
Grab the next digit (5) from the dividend, add it to 124, then carry on: 1245 / 921

Moving on to step 4:
1245 divided by 921 is 1 with a remainder of 324.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we subtract 921 from 1245, we get 324.
Grab the next digit (3) from the dividend, add it to 324, then carry on: 3243 / 921

Moving on to step 5:
921 can be fit into 3243 3 times, resulting in a remainder of 480.
Use 3 as the next digit of our solution. 
Result so far: 13.0
Subtracting 2763 from 3243 leaves us with 480.
Bring next digit (1) of the dividend behind the 480 and repeat the process: 4801 / 921

Step 6:
When dividing 4801 by 921, we get 5 with a remainder of 196.
The next digit of our result is 5. 
Result so far: 135.0
If we subtract 4605 from 4801, we get 196.
Include the next digit (8) from the dividend after 196, then repeat: 1968 / 921

Going ahead to step 7:
921 goes into 1968 2 times with a remainder of 126.
The next digit of our result is 2. 
Result so far: 1352.0
Deduct 1842 from 1968 and we're left with 126.
Take the next digit (7) from the dividend and append it to 126, then repeat: 1267 / 921

Let's proceed to step 8:
The number 921 fits into 1267 1 times, leaving a remainder of 346.
Put 1 as the next digit of the answer. 
Result so far: 13521.0
If we take 921 away from 1267, we end up with 346.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3460, and continue the process.

Let's proceed to step 9:
3460 divided by 921 is 3 with a remainder of 697.
Use 3 as the next digit of our solution. 
Result so far: 13521.3
The remainder is 697 after subtracting 2763 from 3460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6970, and continue the process.

Step 10:
921 goes into 6970 7 times with a remainder of 523.
Use 7 as the next digit of our solution. 
Result so far: 13521.37
If we take 6447 away from 6970, we end up with 523.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5230, and continue the process.

Going ahead to step 11:
If we divide 5230 by 921, we get 5 and a remainder of 625.
Write down 5 as next digit of the result. 
Result so far: 13521.375
The remainder is 625 after subtracting 4605 from 5230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6250, and continue the process.

Moving on to step 12:
When dividing 6250 by 921, we get 6 with a remainder of 724.
Record the quotient 6 as the next digit in the result. 
Result so far: 13521.3756
The remainder is 724 after subtracting 5526 from 6250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7240, and continue the process.

Going ahead to step 13:
When dividing 7240 by 921, we get 7 with a remainder of 793.
Use 7 as the next digit of our solution. 
Result so far: 13521.37567
The remainder is 793 after subtracting 6447 from 7240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7930, and continue the process.

Moving on to step 14:
The number 921 fits into 7930 8 times, leaving a remainder of 562.
The next digit of our result is 8. 
Result so far: 13521.375678
Subtract 7368 from 7930 to get 562.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5620, and continue the process.

Going ahead to step 15:
921 goes into 5620 6 times with a remainder of 94.
Use 6 as the next digit of our solution. 
Result so far: 13521.3756786
Deduct 5526 from 5620 and we're left with 94.
Since there are no more digits in the dividend, we add a zero to the remainder making it 940, and continue the process.

Let's proceed to step 16:
921 goes into 940 1 times with a remainder of 19.
Record the quotient 1 as the next digit in the result. 
Result so far: 13521.37567861
The remainder is 19 after subtracting 921 from 940.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

After the division, we end up with 13521.37567861 and a remainder of 1.9e-08.