We divide 51401670 by 646
We want to figure out the number of times 51401670 can be divided by 646.

Let's proceed to step 1:
646 can be fit into 5 0 times, resulting in a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Take the next digit (1) from the dividend and append it to 5, then repeat: 51 / 646

Step 2:
When dividing 51 by 646, we get 0 with a remainder of 51.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 51 and we're left with 51.
Fetch the next digit (4) from the dividend, attach it to 51 and continue: 514 / 646

Going ahead to step 3:
514 divided by 646 is 0 with a remainder of 514.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 514 and we're left with 514.
Append the next digit (0) from the dividend to 514 and continue with: 5140 / 646

Let's proceed to step 4:
The number 646 fits into 5140 7 times, leaving a remainder of 618.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
Subtract 4522 from 5140 to get 618.
Append the next digit (1) from the dividend to 618 and continue with: 6181 / 646

Going ahead to step 5:
When dividing 6181 by 646, we get 9 with a remainder of 367.
Put 9 as the next digit of the answer. 
Result so far: 79.0
If we take 5814 away from 6181, we end up with 367.
Grab the next digit (6) from the dividend, add it to 367, then carry on: 3676 / 646

Advancing to step 6:
646 can be fit into 3676 5 times, resulting in a remainder of 446.
Write down 5 as next digit of the result. 
Result so far: 795.0
If we subtract 3230 from 3676, we get 446.
Append the next digit (7) from the dividend to 446 and continue with: 4467 / 646

Let's proceed to step 7:
If we divide 4467 by 646, we get 6 and a remainder of 591.
The next digit of our result is 6. 
Result so far: 7956.0
If we take 3876 away from 4467, we end up with 591.
Fetch the next digit (0) from the dividend, attach it to 591 and continue: 5910 / 646

On to step 8:
5910 divided by 646 is 9 with a remainder of 96.
Put 9 as the next digit of the answer. 
Result so far: 79569.0
If we subtract 5814 from 5910, we get 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

Step 9:
646 can be fit into 960 1 times, resulting in a remainder of 314.
The number 1 becomes the next digit in our result. 
Result so far: 79569.1
The remainder is 314 after subtracting 646 from 960.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3140, and continue the process.

Step 10:
3140 divided by 646 is 4 with a remainder of 556.
Use 4 as the next digit of our solution. 
Result so far: 79569.14
The remainder is 556 after subtracting 2584 from 3140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5560, and continue the process.

Let's proceed to step 11:
When dividing 5560 by 646, we get 8 with a remainder of 392.
The next digit of our result is 8. 
Result so far: 79569.148
The remainder is 392 after subtracting 5168 from 5560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3920, and continue the process.

Step 12:
646 goes into 3920 6 times with a remainder of 44.
Use 6 as the next digit of our solution. 
Result so far: 79569.1486
Subtracting 3876 from 3920 leaves us with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Let's proceed to step 13:
The number 646 fits into 440 0 times, leaving a remainder of 440.
Write down 0 as next digit of the result. 
Result so far: 79569.1486
Deduct 0 from 440 and we're left with 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4400, and continue the process.

Let's proceed to step 14:
646 goes into 4400 6 times with a remainder of 524.
The number 6 becomes the next digit in our result. 
Result so far: 79569.148606
The remainder is 524 after subtracting 3876 from 4400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5240, and continue the process.

Moving on to step 15:
When dividing 5240 by 646, we get 8 with a remainder of 72.
The next digit of our result is 8. 
Result so far: 79569.1486068
Deduct 5168 from 5240 and we're left with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Moving on to step 16:
When dividing 720 by 646, we get 1 with a remainder of 74.
Put 1 as the next digit of the answer. 
Result so far: 79569.14860681
Subtracting 646 from 720 leaves us with 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

In conclusion, the division gives 79569.14860681 with a balance of 7.4e-08.