681239 ÷ 51 
We're looking to find how many times 51 goes into 681239.

On to step 1:
51 can be fit into 6 0 times, resulting in a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Bring next digit (8) of the dividend behind the 6 and repeat the process: 68 / 51

Advancing to step 2:
The number 51 fits into 68 1 times, leaving a remainder of 17.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 51 from 68 and we're left with 17.
Append the next digit (1) from the dividend to 17 and continue with: 171 / 51

Let's proceed to step 3:
51 goes into 171 3 times with a remainder of 18.
Use 3 as the next digit of our solution. 
Result so far: 13.0
Subtracting 153 from 171 leaves us with 18.
Grab the next digit (2) from the dividend, add it to 18, then carry on: 182 / 51

On to step 4:
182 divided by 51 is 3 with a remainder of 29.
Put 3 as the next digit of the answer. 
Result so far: 133.0
If we take 153 away from 182, we end up with 29.
Include the next digit (3) from the dividend after 29, then repeat: 293 / 51

Step 5:
When dividing 293 by 51, we get 5 with a remainder of 38.
The number 5 becomes the next digit in our result. 
Result so far: 1335.0
If we take 255 away from 293, we end up with 38.
Append the next digit (9) from the dividend to 38 and continue with: 389 / 51

Going ahead to step 6:
When dividing 389 by 51, we get 7 with a remainder of 32.
The number 7 becomes the next digit in our result. 
Result so far: 13357.0
Subtract 357 from 389 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.

Advancing to step 7:
320 divided by 51 is 6 with a remainder of 14.
Put 6 as the next digit of the answer. 
Result so far: 13357.6
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.

Moving on to step 8:
140 divided by 51 is 2 with a remainder of 38.
The next digit of our result is 2. 
Result so far: 13357.62
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.

Advancing to step 9:
51 goes into 380 7 times with a remainder of 23.
Record the quotient 7 as the next digit in the result. 
Result so far: 13357.627
Deduct 357 from 380 and we're left with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Step 10:
When dividing 230 by 51, we get 4 with a remainder of 26.
The next digit of our result is 4. 
Result so far: 13357.6274
The remainder is 26 after subtracting 204 from 230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Step 11:
The number 51 fits into 260 5 times, leaving a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 13357.62745
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:
51 goes into 50 0 times with a remainder of 50.
Use 0 as the next digit of our solution. 
Result so far: 13357.62745
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.

Step 13:
When dividing 500 by 51, we get 9 with a remainder of 41.
The number 9 becomes the next digit in our result. 
Result so far: 13357.6274509
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.

Advancing to step 14:
When dividing 410 by 51, we get 8 with a remainder of 2.
The next digit of our result is 8. 
Result so far: 13357.62745098
Deduct 408 from 410 and we're left 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 13357.62745098 and a remainder of 2e-09.