We're dividing 15428457 by 300 
We want to figure out the number of times 15428457 can be divided by 300.

Moving on to step 1:
If we divide 1 by 300, we get 0 and a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Include the next digit (5) from the dividend after 1, then repeat: 15 / 300

Going ahead to step 2:
15 divided by 300 is 0 with a remainder of 15.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 15, we get 15.
Include the next digit (4) from the dividend after 15, then repeat: 154 / 300

Step 3:
If we divide 154 by 300, we get 0 and a remainder of 154.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 154, we end up with 154.
Bring next digit (2) of the dividend behind the 154 and repeat the process: 1542 / 300

Going ahead to step 4:
300 can be fit into 1542 5 times, resulting in a remainder of 42.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
If we take 1500 away from 1542, we end up with 42.
Fetch the next digit (8) from the dividend, attach it to 42 and continue: 428 / 300

Going ahead to step 5:
300 goes into 428 1 times with a remainder of 128.
Record the quotient 1 as the next digit in the result. 
Result so far: 51.0
Deduct 300 from 428 and we're left with 128.
Append the next digit (4) from the dividend to 128 and continue with: 1284 / 300

On to step 6:
If we divide 1284 by 300, we get 4 and a remainder of 84.
Use 4 as the next digit of our solution. 
Result so far: 514.0
The remainder is 84 after subtracting 1200 from 1284.
Append the next digit (5) from the dividend to 84 and continue with: 845 / 300

On to step 7:
When dividing 845 by 300, we get 2 with a remainder of 245.
Record the quotient 2 as the next digit in the result. 
Result so far: 5142.0
If we take 600 away from 845, we end up with 245.
Include the next digit (7) from the dividend after 245, then repeat: 2457 / 300

Let's proceed to step 8:
When dividing 2457 by 300, we get 8 with a remainder of 57.
Write down 8 as next digit of the result. 
Result so far: 51428.0
Subtracting 2400 from 2457 leaves us with 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Step 9:
If we divide 570 by 300, we get 1 and a remainder of 270.
Put 1 as the next digit of the answer. 
Result so far: 51428.1
The remainder is 270 after subtracting 300 from 570.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2700, and continue the process.

Advancing to step 10:
2700 divided by 300 is 9 with a remainder of 0.
The next digit of our result is 9. 
Result so far: 51428.19
Subtracting 2700 from 2700 leaves us 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 11:
If we divide 0 by 300, we get 0 and a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 51428.19
Subtract 0 from 0 to 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.

Going ahead to step 12:
When dividing 0 by 300, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 51428.19
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.

Our division results in 51428.19 with a remaining 0.0.