Let's divide 721456 by 17
Let's see how many times 17 fits into 721456.

On to step 1:
If we divide 7 by 17, we get 0 and a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Include the next digit (2) from the dividend after 7, then repeat: 72 / 17

Going ahead to step 2:
If we divide 72 by 17, we get 4 and a remainder of 4.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Deduct 68 from 72 and we're left with 4.
Bring next digit (1) of the dividend behind the 4 and repeat the process: 41 / 17

Moving on to step 3:
If we divide 41 by 17, we get 2 and a remainder of 7.
Record the quotient 2 as the next digit in the result. 
Result so far: 42.0
If we take 34 away from 41, we end up with 7.
Grab the next digit (4) from the dividend, add it to 7, then carry on: 74 / 17

Advancing to step 4:
The number 17 fits into 74 4 times, leaving a remainder of 6.
The next digit of our result is 4. 
Result so far: 424.0
If we subtract 68 from 74, we get 6.
Include the next digit (5) from the dividend after 6, then repeat: 65 / 17

Let's proceed to step 5:
17 can be fit into 65 3 times, resulting in a remainder of 14.
Put 3 as the next digit of the answer. 
Result so far: 4243.0
Subtract 51 from 65 to get 14.
Include the next digit (6) from the dividend after 14, then repeat: 146 / 17

Going ahead to step 6:
If we divide 146 by 17, we get 8 and a remainder of 10.
Write down 8 as next digit of the result. 
Result so far: 42438.0
If we subtract 136 from 146, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 7:
17 can be fit into 100 5 times, resulting in a remainder of 15.
The next digit of our result is 5. 
Result so far: 42438.5
Subtracting 85 from 100 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 8:
17 can be fit into 150 8 times, resulting in a remainder of 14.
Put 8 as the next digit of the answer. 
Result so far: 42438.58
Subtracting 136 from 150 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.

Moving on to step 9:
When dividing 140 by 17, we get 8 with a remainder of 4.
Use 8 as the next digit of our solution. 
Result so far: 42438.588
Subtract 136 from 140 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

The quotient of the division is 42438.588, and the remainder is 0.0004.