We're dividing 309425 by 10 
We want to figure out the number of times 309425 can be divided by 10.

On to step 1:
When dividing 3 by 10, we get 0 with a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Fetch the next digit (0) from the dividend, attach it to 3 and continue: 30 / 10

Going ahead to step 2:
When dividing 30 by 10, we get 3 with a remainder of 0.
Put 3 as the next digit of the answer. 
Result so far: 3.0
Subtract 30 from 30 to get 0.
Fetch the next digit (9) from the dividend, attach it to 0 and continue: 9 / 10

Moving on to step 3:
If we divide 9 by 10, we get 0 and a remainder of 9.
The next digit of our result is 0. 
Result so far: 30.0
The remainder is 9 after subtracting 0 from 9.
Grab the next digit (4) from the dividend, add it to 9, then carry on: 94 / 10

Moving on to step 4:
If we divide 94 by 10, we get 9 and a remainder of 4.
Use 9 as the next digit of our solution. 
Result so far: 309.0
If we subtract 90 from 94, we get 4.
Take the next digit (2) from the dividend and append it to 4, then repeat: 42 / 10

On to step 5:
10 can be fit into 42 4 times, resulting in a remainder of 2.
Put 4 as the next digit of the answer. 
Result so far: 3094.0
Deduct 40 from 42 and we're left with 2.
Take the next digit (5) from the dividend and append it to 2, then repeat: 25 / 10

On to step 6:
When dividing 25 by 10, we get 2 with a remainder of 5.
Record the quotient 2 as the next digit in the result. 
Result so far: 30942.0
Subtracting 20 from 25 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 7:
10 goes into 50 5 times with a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 30942.5
If we subtract 50 from 50, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 8:
The number 10 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 30942.5
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.

Advancing to step 9:
When dividing 0 by 10, we get 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 30942.5
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 result is 30942.5 with a remainder of 0.0.