789512 ÷ 51 
We want to figure out the number of times 789512 can be divided by 51.

Step 1:
If we divide 7 by 51, we get 0 and a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Take the next digit (8) from the dividend and append it to 7, then repeat: 78 / 51

Moving on to step 2:
78 divided by 51 is 1 with a remainder of 27.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtracting 51 from 78 leaves us with 27.
Append the next digit (9) from the dividend to 27 and continue with: 279 / 51

Advancing to step 3:
When dividing 279 by 51, we get 5 with a remainder of 24.
Use 5 as the next digit of our solution. 
Result so far: 15.0
If we subtract 255 from 279, we get 24.
Grab the next digit (5) from the dividend, add it to 24, then carry on: 245 / 51

Going ahead to step 4:
The number 51 fits into 245 4 times, leaving a remainder of 41.
The number 4 becomes the next digit in our result. 
Result so far: 154.0
Subtract 204 from 245 to get 41.
Fetch the next digit (1) from the dividend, attach it to 41 and continue: 411 / 51

Moving on to step 5:
411 divided by 51 is 8 with a remainder of 3.
Use 8 as the next digit of our solution. 
Result so far: 1548.0
The remainder is 3 after subtracting 408 from 411.
Grab the next digit (2) from the dividend, add it to 3, then carry on: 32 / 51

On to step 6:
32 divided by 51 is 0 with a remainder of 32.
Put 0 as the next digit of the answer. 
Result so far: 15480.0
Subtracting 0 from 32 leaves us with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Advancing to step 7:
The number 51 fits into 320 6 times, leaving a remainder of 14.
Put 6 as the next digit of the answer. 
Result so far: 15480.6
If we subtract 306 from 320, we get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Step 8:
51 goes into 140 2 times with a remainder of 38.
Write down 2 as next digit of the result. 
Result so far: 15480.62
The remainder is 38 after subtracting 102 from 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Step 9:
If we divide 380 by 51, we get 7 and a remainder of 23.
Write down 7 as next digit of the result. 
Result so far: 15480.627
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.

Going ahead to step 10:
51 goes into 230 4 times with a remainder of 26.
The next digit of our result is 4. 
Result so far: 15480.6274
If we take 204 away from 230, we end up 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.

Moving on to step 11:
260 divided by 51 is 5 with a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 15480.62745
Subtract 255 from 260 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Let's proceed to step 12:
51 goes into 50 0 times with a remainder of 50.
Use 0 as the next digit of our solution. 
Result so far: 15480.62745
If we take 0 away from 50, we end up with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Advancing to step 13:
51 can be fit into 500 9 times, resulting in a remainder of 41.
Use 9 as the next digit of our solution. 
Result so far: 15480.6274509
Subtracting 459 from 500 leaves us with 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Going ahead to step 14:
51 goes into 410 8 times with a remainder of 2.
The next digit of our result is 8. 
Result so far: 15480.62745098
If we take 408 away from 410, we end up 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.

Our division results in 15480.62745098 with a remaining 2e-09.