66872798 ÷ 420 
Let's see how many times 420 fits into 66872798.

Advancing to step 1:
6 divided by 420 is 0 with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 420

On to step 2:
If we divide 66 by 420, we get 0 and a remainder of 66.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 66 to get 66.
Take the next digit (8) from the dividend and append it to 66, then repeat: 668 / 420

Moving on to step 3:
668 divided by 420 is 1 with a remainder of 248.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 420 from 668 and we're left with 248.
Bring next digit (7) of the dividend behind the 248 and repeat the process: 2487 / 420

Advancing to step 4:
When dividing 2487 by 420, we get 5 with a remainder of 387.
The next digit of our result is 5. 
Result so far: 15.0
The remainder is 387 after subtracting 2100 from 2487.
Include the next digit (2) from the dividend after 387, then repeat: 3872 / 420

Step 5:
If we divide 3872 by 420, we get 9 and a remainder of 92.
Write down 9 as next digit of the result. 
Result so far: 159.0
If we take 3780 away from 3872, we end up with 92.
Include the next digit (7) from the dividend after 92, then repeat: 927 / 420

Let's proceed to step 6:
The number 420 fits into 927 2 times, leaving a remainder of 87.
The next digit of our result is 2. 
Result so far: 1592.0
If we take 840 away from 927, we end up with 87.
Fetch the next digit (9) from the dividend, attach it to 87 and continue: 879 / 420

Moving on to step 7:
420 goes into 879 2 times with a remainder of 39.
Put 2 as the next digit of the answer. 
Result so far: 15922.0
Subtracting 840 from 879 leaves us with 39.
Append the next digit (8) from the dividend to 39 and continue with: 398 / 420

Advancing to step 8:
420 can be fit into 398 0 times, resulting in a remainder of 398.
The number 0 becomes the next digit in our result. 
Result so far: 159220.0
Deduct 0 from 398 and we're left with 398.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3980, and continue the process.

Step 9:
420 goes into 3980 9 times with a remainder of 200.
Use 9 as the next digit of our solution. 
Result so far: 159220.9
If we subtract 3780 from 3980, we get 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Step 10:
The number 420 fits into 2000 4 times, leaving a remainder of 320.
Record the quotient 4 as the next digit in the result. 
Result so far: 159220.94
Subtracting 1680 from 2000 leaves us with 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

On to step 11:
When dividing 3200 by 420, we get 7 with a remainder of 260.
The next digit of our result is 7. 
Result so far: 159220.947
Subtract 2940 from 3200 to get 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

Let's proceed to step 12:
The number 420 fits into 2600 6 times, leaving a remainder of 80.
Use 6 as the next digit of our solution. 
Result so far: 159220.9476
The remainder is 80 after subtracting 2520 from 2600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

On to step 13:
800 divided by 420 is 1 with a remainder of 380.
Put 1 as the next digit of the answer. 
Result so far: 159220.94761
Subtracting 420 from 800 leaves us with 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3800, and continue the process.

Step 14:
420 goes into 3800 9 times with a remainder of 20.
The next digit of our result is 9. 
Result so far: 159220.947619
Subtracting 3780 from 3800 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 15:
If we divide 200 by 420, we get 0 and a remainder of 200.
The next digit of our result is 0. 
Result so far: 159220.947619
The remainder is 200 after subtracting 0 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Let's proceed to step 16:
If we divide 2000 by 420, we get 4 and a remainder of 320.
Use 4 as the next digit of our solution. 
Result so far: 159220.94761904
Deduct 1680 from 2000 and we're left with 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

The final outcome is 159220.94761904, with a leftover of 3.2e-07.