We look at the division of 66301971 by 543 
We want to figure out the number of times 66301971 can be divided by 543.

Step 1:
The number 543 fits into 6 0 times, leaving a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Fetch the next digit (6) from the dividend, attach it to 6 and continue: 66 / 543

Let's proceed to step 2:
If we divide 66 by 543, we get 0 and a remainder of 66.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 66 after subtracting 0 from 66.
Grab the next digit (3) from the dividend, add it to 66, then carry on: 663 / 543

On to step 3:
If we divide 663 by 543, we get 1 and a remainder of 120.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 543 from 663, we get 120.
Fetch the next digit (0) from the dividend, attach it to 120 and continue: 1200 / 543

Going ahead to step 4:
543 goes into 1200 2 times with a remainder of 114.
The next digit of our result is 2. 
Result so far: 12.0
Subtracting 1086 from 1200 leaves us with 114.
Append the next digit (1) from the dividend to 114 and continue with: 1141 / 543

Advancing to step 5:
543 can be fit into 1141 2 times, resulting in a remainder of 55.
Use 2 as the next digit of our solution. 
Result so far: 122.0
If we take 1086 away from 1141, we end up with 55.
Append the next digit (9) from the dividend to 55 and continue with: 559 / 543

Advancing to step 6:
The number 543 fits into 559 1 times, leaving a remainder of 16.
The next digit of our result is 1. 
Result so far: 1221.0
If we subtract 543 from 559, we get 16.
Bring next digit (7) of the dividend behind the 16 and repeat the process: 167 / 543

Advancing to step 7:
167 divided by 543 is 0 with a remainder of 167.
Write down 0 as next digit of the result. 
Result so far: 12210.0
Deduct 0 from 167 and we're left with 167.
Include the next digit (1) from the dividend after 167, then repeat: 1671 / 543

Moving on to step 8:
When dividing 1671 by 543, we get 3 with a remainder of 42.
Record the quotient 3 as the next digit in the result. 
Result so far: 122103.0
If we take 1629 away from 1671, we end up with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Going ahead to step 9:
When dividing 420 by 543, we get 0 with a remainder of 420.
Write down 0 as next digit of the result. 
Result so far: 122103.0
The remainder is 420 after subtracting 0 from 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4200, and continue the process.

On to step 10:
543 goes into 4200 7 times with a remainder of 399.
Record the quotient 7 as the next digit in the result. 
Result so far: 122103.07
If we subtract 3801 from 4200, we get 399.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3990, and continue the process.

Step 11:
The number 543 fits into 3990 7 times, leaving a remainder of 189.
The number 7 becomes the next digit in our result. 
Result so far: 122103.077
The remainder is 189 after subtracting 3801 from 3990.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1890, and continue the process.

The final result is 122103.077 with a remainder of 0.0189.