We divide 251409 by 3
We want to figure out the number of times 251409 can be divided by 3.

Let's proceed to step 1:
2 divided by 3 is 0 with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Grab the next digit (5) from the dividend, add it to 2, then carry on: 25 / 3

Moving on to step 2:
The number 3 fits into 25 8 times, leaving a remainder of 1.
Use 8 as the next digit of our solution. 
Result so far: 8.0
If we subtract 24 from 25, we get 1.
Take the next digit (1) from the dividend and append it to 1, then repeat: 11 / 3

Let's proceed to step 3:
3 goes into 11 3 times with a remainder of 2.
The next digit of our result is 3. 
Result so far: 83.0
Subtracting 9 from 11 leaves us with 2.
Bring next digit (4) of the dividend behind the 2 and repeat the process: 24 / 3

On to step 4:
The number 3 fits into 24 8 times, leaving a remainder of 0.
The number 8 becomes the next digit in our result. 
Result so far: 838.0
Subtracting 24 from 24 leaves us with 0.
Fetch the next digit (0) from the dividend, attach it to 0 and continue: 0 / 3

Moving on to step 5:
When dividing 0 by 3, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 8380.0
If we take 0 away from 0, we end up with 0.
Grab the next digit (9) from the dividend, add it to 0, then carry on: 9 / 3

Moving on to step 6:
3 goes into 9 3 times with a remainder of 0.
Write down 3 as next digit of the result. 
Result so far: 83803.0
Deduct 9 from 9 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 7:
The number 3 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 83803.0
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 8:
3 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 83803.0
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 83803.0, with a leftover of 0.0.