778438 ÷ 51 
We're looking to find how many times 51 goes into 778438.

Step 1:
If we divide 7 by 51, we get 0 and a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Grab the next digit (7) from the dividend, add it to 7, then carry on: 77 / 51

Let's proceed to step 2:
The number 51 fits into 77 1 times, leaving a remainder of 26.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtract 51 from 77 to get 26.
Include the next digit (8) from the dividend after 26, then repeat: 268 / 51

Let's proceed to step 3:
When dividing 268 by 51, we get 5 with a remainder of 13.
The number 5 becomes the next digit in our result. 
Result so far: 15.0
Deduct 255 from 268 and we're left with 13.
Fetch the next digit (4) from the dividend, attach it to 13 and continue: 134 / 51

Moving on to step 4:
If we divide 134 by 51, we get 2 and a remainder of 32.
Use 2 as the next digit of our solution. 
Result so far: 152.0
Subtract 102 from 134 to get 32.
Include the next digit (3) from the dividend after 32, then repeat: 323 / 51

Going ahead to step 5:
If we divide 323 by 51, we get 6 and a remainder of 17.
The next digit of our result is 6. 
Result so far: 1526.0
If we take 306 away from 323, we end up with 17.
Append the next digit (8) from the dividend to 17 and continue with: 178 / 51

Advancing to step 6:
51 can be fit into 178 3 times, resulting in a remainder of 25.
Put 3 as the next digit of the answer. 
Result so far: 15263.0
If we subtract 153 from 178, we get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Moving on to step 7:
The number 51 fits into 250 4 times, leaving a remainder of 46.
Put 4 as the next digit of the answer. 
Result so far: 15263.4
If we subtract 204 from 250, we get 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Moving on to step 8:
The number 51 fits into 460 9 times, leaving a remainder of 1.
Record the quotient 9 as the next digit in the result. 
Result so far: 15263.49
If we take 459 away from 460, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 9:
If we divide 10 by 51, we get 0 and a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 15263.49
If we subtract 0 from 10, 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.

Let's proceed to step 10:
If we divide 100 by 51, we get 1 and a remainder of 49.
Write down 1 as next digit of the result. 
Result so far: 15263.4901
Deduct 51 from 100 and we're left with 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Let's proceed to step 11:
490 divided by 51 is 9 with a remainder of 31.
Use 9 as the next digit of our solution. 
Result so far: 15263.49019
Subtract 459 from 490 to get 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

On to step 12:
310 divided by 51 is 6 with a remainder of 4.
The number 6 becomes the next digit in our result. 
Result so far: 15263.490196
Subtracting 306 from 310 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 13:
The number 51 fits into 40 0 times, leaving a remainder of 40.
The next digit of our result is 0. 
Result so far: 15263.490196
Deduct 0 from 40 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 14:
If we divide 400 by 51, we get 7 and a remainder of 43.
Put 7 as the next digit of the answer. 
Result so far: 15263.49019607
The remainder is 43 after subtracting 357 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

The final result is 15263.49019607 with a remainder of 4.3e-08.