858158 ÷ 51 
We're looking to find how many times 51 goes into 858158.

Let's proceed to step 1:
8 divided by 51 is 0 with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Take the next digit (5) from the dividend and append it to 8, then repeat: 85 / 51

Advancing to step 2:
85 divided by 51 is 1 with a remainder of 34.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtracting 51 from 85 leaves us with 34.
Bring next digit (8) of the dividend behind the 34 and repeat the process: 348 / 51

On to step 3:
When dividing 348 by 51, we get 6 with a remainder of 42.
The next digit of our result is 6. 
Result so far: 16.0
The remainder is 42 after subtracting 306 from 348.
Fetch the next digit (1) from the dividend, attach it to 42 and continue: 421 / 51

Step 4:
The number 51 fits into 421 8 times, leaving a remainder of 13.
Use 8 as the next digit of our solution. 
Result so far: 168.0
If we subtract 408 from 421, we get 13.
Bring next digit (5) of the dividend behind the 13 and repeat the process: 135 / 51

Advancing to step 5:
The number 51 fits into 135 2 times, leaving a remainder of 33.
Record the quotient 2 as the next digit in the result. 
Result so far: 1682.0
Subtracting 102 from 135 leaves us with 33.
Grab the next digit (8) from the dividend, add it to 33, then carry on: 338 / 51

Going ahead to step 6:
If we divide 338 by 51, we get 6 and a remainder of 32.
The next digit of our result is 6. 
Result so far: 16826.0
Subtract 306 from 338 to get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Let's proceed to step 7:
320 divided by 51 is 6 with a remainder of 14.
Use 6 as the next digit of our solution. 
Result so far: 16826.6
Deduct 306 from 320 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

On to step 8:
140 divided by 51 is 2 with a remainder of 38.
Write down 2 as next digit of the result. 
Result so far: 16826.62
Subtracting 102 from 140 leaves us with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Moving on to step 9:
If we divide 380 by 51, we get 7 and a remainder of 23.
Use 7 as the next digit of our solution. 
Result so far: 16826.627
Subtract 357 from 380 to get 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Moving on to step 10:
If we divide 230 by 51, we get 4 and a remainder of 26.
Put 4 as the next digit of the answer. 
Result so far: 16826.6274
Deduct 204 from 230 and we're left with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Advancing to step 11:
When dividing 260 by 51, we get 5 with a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 16826.62745
Subtracting 255 from 260 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 12:
If we divide 50 by 51, we get 0 and a remainder of 50.
The next digit of our result is 0. 
Result so far: 16826.62745
The remainder is 50 after subtracting 0 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Let's proceed to step 13:
When dividing 500 by 51, we get 9 with a remainder of 41.
The next digit of our result is 9. 
Result so far: 16826.6274509
Subtract 459 from 500 to get 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

On to step 14:
When dividing 410 by 51, we get 8 with a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 16826.62745098
Subtracting 408 from 410 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

After the division, we end up with 16826.62745098 and a remainder of 2e-09.