We divide 12543857 by 990
We want to figure out the number of times 12543857 can be divided by 990.

Step 1:
If we divide 1 by 990, we get 0 and a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 990

Advancing to step 2:
If we divide 12 by 990, we get 0 and a remainder of 12.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 12, we end up with 12.
Bring next digit (5) of the dividend behind the 12 and repeat the process: 125 / 990

Going ahead to step 3:
990 goes into 125 0 times with a remainder of 125.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 125 after subtracting 0 from 125.
Grab the next digit (4) from the dividend, add it to 125, then carry on: 1254 / 990

Let's proceed to step 4:
990 can be fit into 1254 1 times, resulting in a remainder of 264.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 990 from 1254 to get 264.
Append the next digit (3) from the dividend to 264 and continue with: 2643 / 990

Moving on to step 5:
2643 divided by 990 is 2 with a remainder of 663.
Use 2 as the next digit of our solution. 
Result so far: 12.0
Deduct 1980 from 2643 and we're left with 663.
Take the next digit (8) from the dividend and append it to 663, then repeat: 6638 / 990

Moving on to step 6:
990 goes into 6638 6 times with a remainder of 698.
Use 6 as the next digit of our solution. 
Result so far: 126.0
Subtracting 5940 from 6638 leaves us with 698.
Take the next digit (5) from the dividend and append it to 698, then repeat: 6985 / 990

Let's proceed to step 7:
When dividing 6985 by 990, we get 7 with a remainder of 55.
The next digit of our result is 7. 
Result so far: 1267.0
If we subtract 6930 from 6985, we get 55.
Fetch the next digit (7) from the dividend, attach it to 55 and continue: 557 / 990

Step 8:
When dividing 557 by 990, we get 0 with a remainder of 557.
Put 0 as the next digit of the answer. 
Result so far: 12670.0
If we subtract 0 from 557, we get 557.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5570, and continue the process.

Let's proceed to step 9:
If we divide 5570 by 990, we get 5 and a remainder of 620.
Record the quotient 5 as the next digit in the result. 
Result so far: 12670.5
If we take 4950 away from 5570, we end up with 620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6200, and continue the process.

Advancing to step 10:
990 can be fit into 6200 6 times, resulting in a remainder of 260.
Use 6 as the next digit of our solution. 
Result so far: 12670.56
The remainder is 260 after subtracting 5940 from 6200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

On to step 11:
2600 divided by 990 is 2 with a remainder of 620.
The number 2 becomes the next digit in our result. 
Result so far: 12670.562
Subtracting 1980 from 2600 leaves us with 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 12:
990 can be fit into 6200 6 times, resulting in a remainder of 260.
Put 6 as the next digit of the answer. 
Result so far: 12670.5626
Subtracting 5940 from 6200 leaves us with 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

Moving on to step 13:
990 can be fit into 2600 2 times, resulting in a remainder of 620.
Record the quotient 2 as the next digit in the result. 
Result so far: 12670.56262
Subtracting 1980 from 2600 leaves us with 620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6200, and continue the process.

Advancing to step 14:
When dividing 6200 by 990, we get 6 with a remainder of 260.
The number 6 becomes the next digit in our result. 
Result so far: 12670.562626
Deduct 5940 from 6200 and we're left with 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

On to step 15:
990 goes into 2600 2 times with a remainder of 620.
The number 2 becomes the next digit in our result. 
Result so far: 12670.5626262
If we take 1980 away from 2600, we end up with 620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6200, and continue the process.

Moving on to step 16:
990 goes into 6200 6 times with a remainder of 260.
Use 6 as the next digit of our solution. 
Result so far: 12670.56262626
If we take 5940 away from 6200, we end up with 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

The final outcome is 12670.56262626, with a leftover of 2.6e-07.