We look at the division of 51858370 by 15 
Let's see how many times 15 fits into 51858370.

Advancing to step 1:
5 divided by 15 is 0 with a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Append the next digit (1) from the dividend to 5 and continue with: 51 / 15

Step 2:
15 can be fit into 51 3 times, resulting in a remainder of 6.
Use 3 as the next digit of our solution. 
Result so far: 3.0
If we take 45 away from 51, we end up with 6.
Fetch the next digit (8) from the dividend, attach it to 6 and continue: 68 / 15

Let's proceed to step 3:
The number 15 fits into 68 4 times, leaving a remainder of 8.
The next digit of our result is 4. 
Result so far: 34.0
If we subtract 60 from 68, we get 8.
Fetch the next digit (5) from the dividend, attach it to 8 and continue: 85 / 15

Let's proceed to step 4:
15 can be fit into 85 5 times, resulting in a remainder of 10.
Record the quotient 5 as the next digit in the result. 
Result so far: 345.0
Subtract 75 from 85 to get 10.
Take the next digit (8) from the dividend and append it to 10, then repeat: 108 / 15

Moving on to step 5:
The number 15 fits into 108 7 times, leaving a remainder of 3.
The next digit of our result is 7. 
Result so far: 3457.0
If we take 105 away from 108, we end up with 3.
Fetch the next digit (3) from the dividend, attach it to 3 and continue: 33 / 15

Moving on to step 6:
The number 15 fits into 33 2 times, leaving a remainder of 3.
Use 2 as the next digit of our solution. 
Result so far: 34572.0
If we take 30 away from 33, we end up with 3.
Append the next digit (7) from the dividend to 3 and continue with: 37 / 15

Going ahead to step 7:
If we divide 37 by 15, we get 2 and a remainder of 7.
The number 2 becomes the next digit in our result. 
Result so far: 345722.0
The remainder is 7 after subtracting 30 from 37.
Append the next digit (0) from the dividend to 7 and continue with: 70 / 15

On to step 8:
15 can be fit into 70 4 times, resulting in a remainder of 10.
Record the quotient 4 as the next digit in the result. 
Result so far: 3457224.0
If we subtract 60 from 70, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 9:
15 can be fit into 100 6 times, resulting in a remainder of 10.
Put 6 as the next digit of the answer. 
Result so far: 3457224.6
If we take 90 away from 100, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 10:
When dividing 100 by 15, we get 6 with a remainder of 10.
Use 6 as the next digit of our solution. 
Result so far: 3457224.66
If we take 90 away from 100, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final result is 3457224.66 with a remainder of 0.01.