402354 ÷ 15 
Our goal is to divide 402354 by 15.

Let's proceed to step 1:
The number 15 fits into 4 0 times, leaving a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Include the next digit (0) from the dividend after 4, then repeat: 40 / 15

Let's proceed to step 2:
If we divide 40 by 15, we get 2 and a remainder of 10.
The next digit of our result is 2. 
Result so far: 2.0
Deduct 30 from 40 and we're left with 10.
Grab the next digit (2) from the dividend, add it to 10, then carry on: 102 / 15

Advancing to step 3:
15 can be fit into 102 6 times, resulting in a remainder of 12.
The next digit of our result is 6. 
Result so far: 26.0
The remainder is 12 after subtracting 90 from 102.
Grab the next digit (3) from the dividend, add it to 12, then carry on: 123 / 15

Step 4:
If we divide 123 by 15, we get 8 and a remainder of 3.
Record the quotient 8 as the next digit in the result. 
Result so far: 268.0
Subtracting 120 from 123 leaves us with 3.
Grab the next digit (5) from the dividend, add it to 3, then carry on: 35 / 15

Step 5:
15 can be fit into 35 2 times, resulting in a remainder of 5.
Write down 2 as next digit of the result. 
Result so far: 2682.0
If we subtract 30 from 35, we get 5.
Include the next digit (4) from the dividend after 5, then repeat: 54 / 15

Moving on to step 6:
15 goes into 54 3 times with a remainder of 9.
The next digit of our result is 3. 
Result so far: 26823.0
If we take 45 away from 54, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 7:
The number 15 fits into 90 6 times, leaving a remainder of 0.
The number 6 becomes the next digit in our result. 
Result so far: 26823.6
The remainder is 0 after subtracting 90 from 90.
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:
15 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 26823.6
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 9:
15 goes into 0 0 times with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 26823.6
Deduct 0 from 0 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.

The final result is 26823.6 with a remainder of 0.0.