66840405 divided by 280 
We want to figure out the number of times 66840405 can be divided by 280.

Going ahead to step 1:
If we divide 6 by 280, we get 0 and a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 280

Going ahead to step 2:
When dividing 66 by 280, we get 0 with 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.
Take the next digit (8) from the dividend and append it to 66, then repeat: 668 / 280

Advancing to step 3:
668 divided by 280 is 2 with a remainder of 108.
The next digit of our result is 2. 
Result so far: 2.0
If we subtract 560 from 668, we get 108.
Include the next digit (4) from the dividend after 108, then repeat: 1084 / 280

On to step 4:
The number 280 fits into 1084 3 times, leaving a remainder of 244.
The number 3 becomes the next digit in our result. 
Result so far: 23.0
If we subtract 840 from 1084, we get 244.
Bring next digit (0) of the dividend behind the 244 and repeat the process: 2440 / 280

Let's proceed to step 5:
The number 280 fits into 2440 8 times, leaving a remainder of 200.
Record the quotient 8 as the next digit in the result. 
Result so far: 238.0
If we take 2240 away from 2440, we end up with 200.
Append the next digit (4) from the dividend to 200 and continue with: 2004 / 280

On to step 6:
When dividing 2004 by 280, we get 7 with a remainder of 44.
The number 7 becomes the next digit in our result. 
Result so far: 2387.0
The remainder is 44 after subtracting 1960 from 2004.
Fetch the next digit (0) from the dividend, attach it to 44 and continue: 440 / 280

On to step 7:
280 can be fit into 440 1 times, resulting in a remainder of 160.
The next digit of our result is 1. 
Result so far: 23871.0
Subtract 280 from 440 to get 160.
Bring next digit (5) of the dividend behind the 160 and repeat the process: 1605 / 280

Step 8:
1605 divided by 280 is 5 with a remainder of 205.
The number 5 becomes the next digit in our result. 
Result so far: 238715.0
If we take 1400 away from 1605, we end up with 205.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2050, and continue the process.

Let's proceed to step 9:
280 goes into 2050 7 times with a remainder of 90.
The number 7 becomes the next digit in our result. 
Result so far: 238715.7
If we subtract 1960 from 2050, we get 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

On to step 10:
280 can be fit into 900 3 times, resulting in a remainder of 60.
The next digit of our result is 3. 
Result so far: 238715.73
The remainder is 60 after subtracting 840 from 900.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 11:
280 goes into 600 2 times with a remainder of 40.
Write down 2 as next digit of the result. 
Result so far: 238715.732
Subtracting 560 from 600 leaves us with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Moving on to step 12:
When dividing 400 by 280, we get 1 with a remainder of 120.
Put 1 as the next digit of the answer. 
Result so far: 238715.7321
Subtract 280 from 400 to get 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Advancing to step 13:
The number 280 fits into 1200 4 times, leaving a remainder of 80.
The number 4 becomes the next digit in our result. 
Result so far: 238715.73214
The remainder is 80 after subtracting 1120 from 1200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Going ahead to step 14:
280 goes into 800 2 times with a remainder of 240.
The next digit of our result is 2. 
Result so far: 238715.732142
Deduct 560 from 800 and we're left with 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Moving on to step 15:
If we divide 2400 by 280, we get 8 and a remainder of 160.
The next digit of our result is 8. 
Result so far: 238715.7321428
Subtracting 2240 from 2400 leaves us with 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Let's proceed to step 16:
280 goes into 1600 5 times with a remainder of 200.
Use 5 as the next digit of our solution. 
Result so far: 238715.73214285
Subtract 1400 from 1600 to 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.

The final outcome is 238715.73214285, with a leftover of 2e-07.