We're dividing 15946510 by 451 
We want to figure out the number of times 15946510 can be divided by 451.

Let's proceed to step 1:
1 divided by 451 is 0 with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Include the next digit (5) from the dividend after 1, then repeat: 15 / 451

Advancing to step 2:
When dividing 15 by 451, we get 0 with a remainder of 15.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 15 after subtracting 0 from 15.
Bring next digit (9) of the dividend behind the 15 and repeat the process: 159 / 451

Advancing to step 3:
159 divided by 451 is 0 with a remainder of 159.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 159, we end up with 159.
Bring next digit (4) of the dividend behind the 159 and repeat the process: 1594 / 451

Let's proceed to step 4:
451 goes into 1594 3 times with a remainder of 241.
The next digit of our result is 3. 
Result so far: 3.0
Subtracting 1353 from 1594 leaves us with 241.
Append the next digit (6) from the dividend to 241 and continue with: 2416 / 451

Going ahead to step 5:
451 goes into 2416 5 times with a remainder of 161.
Use 5 as the next digit of our solution. 
Result so far: 35.0
If we subtract 2255 from 2416, we get 161.
Grab the next digit (5) from the dividend, add it to 161, then carry on: 1615 / 451

Moving on to step 6:
The number 451 fits into 1615 3 times, leaving a remainder of 262.
The number 3 becomes the next digit in our result. 
Result so far: 353.0
Subtract 1353 from 1615 to get 262.
Take the next digit (1) from the dividend and append it to 262, then repeat: 2621 / 451

Step 7:
451 goes into 2621 5 times with a remainder of 366.
The number 5 becomes the next digit in our result. 
Result so far: 3535.0
If we take 2255 away from 2621, we end up with 366.
Take the next digit (0) from the dividend and append it to 366, then repeat: 3660 / 451

Advancing to step 8:
451 can be fit into 3660 8 times, resulting in a remainder of 52.
Put 8 as the next digit of the answer. 
Result so far: 35358.0
The remainder is 52 after subtracting 3608 from 3660.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Step 9:
If we divide 520 by 451, we get 1 and a remainder of 69.
Use 1 as the next digit of our solution. 
Result so far: 35358.1
The remainder is 69 after subtracting 451 from 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Step 10:
The number 451 fits into 690 1 times, leaving a remainder of 239.
The next digit of our result is 1. 
Result so far: 35358.11
Deduct 451 from 690 and we're left with 239.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2390, and continue the process.

The final outcome is 35358.11, with a leftover of 0.239.