We're dividing 11661123 by 643 
We want to divide 11661123 by 643.

Moving on to step 1:
If we divide 1 by 643, 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 subtract 0 from 1, we get 1.
Append the next digit (1) from the dividend to 1 and continue with: 11 / 643

Let's proceed to step 2:
The number 643 fits into 11 0 times, leaving a remainder of 11.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 11 leaves us with 11.
Bring next digit (6) of the dividend behind the 11 and repeat the process: 116 / 643

Let's proceed to step 3:
643 goes into 116 0 times with a remainder of 116.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 116, we get 116.
Append the next digit (6) from the dividend to 116 and continue with: 1166 / 643

Moving on to step 4:
643 goes into 1166 1 times with a remainder of 523.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 643 from 1166 to get 523.
Append the next digit (1) from the dividend to 523 and continue with: 5231 / 643

Let's proceed to step 5:
When dividing 5231 by 643, we get 8 with a remainder of 87.
The number 8 becomes the next digit in our result. 
Result so far: 18.0
If we subtract 5144 from 5231, we get 87.
Append the next digit (1) from the dividend to 87 and continue with: 871 / 643

Advancing to step 6:
643 goes into 871 1 times with a remainder of 228.
Use 1 as the next digit of our solution. 
Result so far: 181.0
The remainder is 228 after subtracting 643 from 871.
Append the next digit (2) from the dividend to 228 and continue with: 2282 / 643

Moving on to step 7:
643 goes into 2282 3 times with a remainder of 353.
Write down 3 as next digit of the result. 
Result so far: 1813.0
Deduct 1929 from 2282 and we're left with 353.
Fetch the next digit (3) from the dividend, attach it to 353 and continue: 3533 / 643

Step 8:
When dividing 3533 by 643, we get 5 with a remainder of 318.
Write down 5 as next digit of the result. 
Result so far: 18135.0
Subtracting 3215 from 3533 leaves us with 318.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3180, and continue the process.

Moving on to step 9:
The number 643 fits into 3180 4 times, leaving a remainder of 608.
Record the quotient 4 as the next digit in the result. 
Result so far: 18135.4
The remainder is 608 after subtracting 2572 from 3180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6080, and continue the process.

Going ahead to step 10:
The number 643 fits into 6080 9 times, leaving a remainder of 293.
The number 9 becomes the next digit in our result. 
Result so far: 18135.49
Subtract 5787 from 6080 to get 293.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2930, and continue the process.

On to step 11:
2930 divided by 643 is 4 with a remainder of 358.
The number 4 becomes the next digit in our result. 
Result so far: 18135.494
If we subtract 2572 from 2930, we 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.

Step 12:
3580 divided by 643 is 5 with a remainder of 365.
The number 5 becomes the next digit in our result. 
Result so far: 18135.4945
Subtract 3215 from 3580 to get 365.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3650, and continue the process.

On to step 13:
3650 divided by 643 is 5 with a remainder of 435.
Put 5 as the next digit of the answer. 
Result so far: 18135.49455
If we subtract 3215 from 3650, we get 435.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4350, and continue the process.

The quotient of the division is 18135.49455, and the remainder is 0.000435.