643442 ÷ 66 
We want to figure out the number of times 643442 can be divided by 66.

Let's proceed to step 1:
66 can be fit into 6 0 times, resulting in a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Include the next digit (4) from the dividend after 6, then repeat: 64 / 66

Step 2:
66 goes into 64 0 times with a remainder of 64.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 64, we end up with 64.
Take the next digit (3) from the dividend and append it to 64, then repeat: 643 / 66

Let's proceed to step 3:
643 divided by 66 is 9 with a remainder of 49.
Write down 9 as next digit of the result. 
Result so far: 9.0
Deduct 594 from 643 and we're left with 49.
Fetch the next digit (4) from the dividend, attach it to 49 and continue: 494 / 66

On to step 4:
The number 66 fits into 494 7 times, leaving a remainder of 32.
Record the quotient 7 as the next digit in the result. 
Result so far: 97.0
Deduct 462 from 494 and we're left with 32.
Append the next digit (4) from the dividend to 32 and continue with: 324 / 66

Advancing to step 5:
66 can be fit into 324 4 times, resulting in a remainder of 60.
Record the quotient 4 as the next digit in the result. 
Result so far: 974.0
Subtract 264 from 324 to get 60.
Include the next digit (2) from the dividend after 60, then repeat: 602 / 66

Going ahead to step 6:
66 goes into 602 9 times with a remainder of 8.
Record the quotient 9 as the next digit in the result. 
Result so far: 9749.0
Subtracting 594 from 602 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 7:
If we divide 80 by 66, we get 1 and a remainder of 14.
The next digit of our result is 1. 
Result so far: 9749.1
Subtracting 66 from 80 leaves us with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Advancing to step 8:
66 goes into 140 2 times with a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 9749.12
If we subtract 132 from 140, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 9:
80 divided by 66 is 1 with a remainder of 14.
Write down 1 as next digit of the result. 
Result so far: 9749.121
Subtracting 66 from 80 leaves us with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

On to step 10:
140 divided by 66 is 2 with a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 9749.1212
Deduct 132 from 140 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 11:
When dividing 80 by 66, we get 1 with a remainder of 14.
Put 1 as the next digit of the answer. 
Result so far: 9749.12121
If we take 66 away from 80, we end up with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 12:
140 divided by 66 is 2 with a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 9749.121212
Subtract 132 from 140 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 13:
66 goes into 80 1 times with a remainder of 14.
The number 1 becomes the next digit in our result. 
Result so far: 9749.1212121
Deduct 66 from 80 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Moving on to step 14:
66 goes into 140 2 times with a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 9749.12121212
Subtract 132 from 140 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The final outcome is 9749.12121212, with a leftover of 8e-09.