Let's divide 88378666 by 509
We want to divide 88378666 by 509.

On to step 1:
If we divide 8 by 509, we get 0 and a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Grab the next digit (8) from the dividend, add it to 8, then carry on: 88 / 509

Advancing to step 2:
The number 509 fits into 88 0 times, leaving a remainder of 88.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 88 leaves us with 88.
Append the next digit (3) from the dividend to 88 and continue with: 883 / 509

Advancing to step 3:
When dividing 883 by 509, we get 1 with a remainder of 374.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtracting 509 from 883 leaves us with 374.
Take the next digit (7) from the dividend and append it to 374, then repeat: 3747 / 509

Going ahead to step 4:
509 can be fit into 3747 7 times, resulting in a remainder of 184.
Record the quotient 7 as the next digit in the result. 
Result so far: 17.0
Subtract 3563 from 3747 to get 184.
Grab the next digit (8) from the dividend, add it to 184, then carry on: 1848 / 509

Advancing to step 5:
509 can be fit into 1848 3 times, resulting in a remainder of 321.
Record the quotient 3 as the next digit in the result. 
Result so far: 173.0
If we take 1527 away from 1848, we end up with 321.
Append the next digit (6) from the dividend to 321 and continue with: 3216 / 509

Moving on to step 6:
509 can be fit into 3216 6 times, resulting in a remainder of 162.
The next digit of our result is 6. 
Result so far: 1736.0
If we subtract 3054 from 3216, we get 162.
Take the next digit (6) from the dividend and append it to 162, then repeat: 1626 / 509

On to step 7:
509 can be fit into 1626 3 times, resulting in a remainder of 99.
Use 3 as the next digit of our solution. 
Result so far: 17363.0
The remainder is 99 after subtracting 1527 from 1626.
Append the next digit (6) from the dividend to 99 and continue with: 996 / 509

Going ahead to step 8:
509 goes into 996 1 times with a remainder of 487.
Use 1 as the next digit of our solution. 
Result so far: 173631.0
Subtract 509 from 996 to get 487.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4870, and continue the process.

On to step 9:
The number 509 fits into 4870 9 times, leaving a remainder of 289.
Record the quotient 9 as the next digit in the result. 
Result so far: 173631.9
If we subtract 4581 from 4870, we get 289.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2890, and continue the process.

Going ahead to step 10:
509 goes into 2890 5 times with a remainder of 345.
Put 5 as the next digit of the answer. 
Result so far: 173631.95
The remainder is 345 after subtracting 2545 from 2890.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3450, and continue the process.

Moving on to step 11:
509 can be fit into 3450 6 times, resulting in a remainder of 396.
Record the quotient 6 as the next digit in the result. 
Result so far: 173631.956
The remainder is 396 after subtracting 3054 from 3450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3960, and continue the process.

On to step 12:
509 goes into 3960 7 times with a remainder of 397.
The next digit of our result is 7. 
Result so far: 173631.9567
The remainder is 397 after subtracting 3563 from 3960.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3970, and continue the process.

On to step 13:
509 can be fit into 3970 7 times, resulting in a remainder of 407.
Use 7 as the next digit of our solution. 
Result so far: 173631.95677
If we take 3563 away from 3970, we end up with 407.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4070, and continue the process.

The final result is 173631.95677 with a remainder of 0.000407.