We're dividing 51454550 by 858 
We're looking to find how many times 858 goes into 51454550.

Going ahead to step 1:
The number 858 fits into 5 0 times, leaving a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Append the next digit (1) from the dividend to 5 and continue with: 51 / 858

On to step 2:
51 divided by 858 is 0 with a remainder of 51.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 51 leaves us with 51.
Bring next digit (4) of the dividend behind the 51 and repeat the process: 514 / 858

Advancing to step 3:
If we divide 514 by 858, we get 0 and a remainder of 514.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 514 leaves us with 514.
Bring next digit (5) of the dividend behind the 514 and repeat the process: 5145 / 858

Moving on to step 4:
When dividing 5145 by 858, we get 5 with a remainder of 855.
Write down 5 as next digit of the result. 
Result so far: 5.0
The remainder is 855 after subtracting 4290 from 5145.
Append the next digit (4) from the dividend to 855 and continue with: 8554 / 858

Advancing to step 5:
If we divide 8554 by 858, we get 9 and a remainder of 832.
Record the quotient 9 as the next digit in the result. 
Result so far: 59.0
If we subtract 7722 from 8554, we get 832.
Fetch the next digit (5) from the dividend, attach it to 832 and continue: 8325 / 858

Going ahead to step 6:
8325 divided by 858 is 9 with a remainder of 603.
The number 9 becomes the next digit in our result. 
Result so far: 599.0
Deduct 7722 from 8325 and we're left with 603.
Append the next digit (5) from the dividend to 603 and continue with: 6035 / 858

Let's proceed to step 7:
When dividing 6035 by 858, we get 7 with a remainder of 29.
Write down 7 as next digit of the result. 
Result so far: 5997.0
Deduct 6006 from 6035 and we're left with 29.
Append the next digit (0) from the dividend to 29 and continue with: 290 / 858

Going ahead to step 8:
If we divide 290 by 858, we get 0 and a remainder of 290.
Write down 0 as next digit of the result. 
Result so far: 59970.0
Subtracting 0 from 290 leaves us with 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2900, and continue the process.

Step 9:
2900 divided by 858 is 3 with a remainder of 326.
The next digit of our result is 3. 
Result so far: 59970.3
Deduct 2574 from 2900 and we're left with 326.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3260, and continue the process.

Moving on to step 10:
The number 858 fits into 3260 3 times, leaving a remainder of 686.
The next digit of our result is 3. 
Result so far: 59970.33
Subtracting 2574 from 3260 leaves us with 686.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6860, and continue the process.

The final outcome is 59970.33, with a leftover of 0.686.