We're dividing 51457 by 86 
We're looking to find how many times 86 goes into 51457.

Step 1:
When dividing 5 by 86, we get 0 with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Grab the next digit (1) from the dividend, add it to 5, then carry on: 51 / 86

Let's proceed to step 2:
86 can be fit into 51 0 times, resulting in a remainder of 51.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 51 leaves us with 51.
Take the next digit (4) from the dividend and append it to 51, then repeat: 514 / 86

Moving on to step 3:
86 can be fit into 514 5 times, resulting in a remainder of 84.
Put 5 as the next digit of the answer. 
Result so far: 5.0
Subtracting 430 from 514 leaves us with 84.
Take the next digit (5) from the dividend and append it to 84, then repeat: 845 / 86

Step 4:
When dividing 845 by 86, we get 9 with a remainder of 71.
Record the quotient 9 as the next digit in the result. 
Result so far: 59.0
If we subtract 774 from 845, we get 71.
Take the next digit (7) from the dividend and append it to 71, then repeat: 717 / 86

Going ahead to step 5:
717 divided by 86 is 8 with a remainder of 29.
Use 8 as the next digit of our solution. 
Result so far: 598.0
If we take 688 away from 717, we end up with 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

On to step 6:
If we divide 290 by 86, we get 3 and a remainder of 32.
The number 3 becomes the next digit in our result. 
Result so far: 598.3
The remainder is 32 after subtracting 258 from 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

On to step 7:
If we divide 320 by 86, we get 3 and a remainder of 62.
Use 3 as the next digit of our solution. 
Result so far: 598.33
Subtract 258 from 320 to get 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

After the division, we end up with 598.33 and a remainder of 0.062.