51504457 ÷ 879 
We want to figure out the number of times 51504457 can be divided by 879.

On to step 1:
When dividing 5 by 879, we get 0 with a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Grab the next digit (1) from the dividend, add it to 5, then carry on: 51 / 879

Advancing to step 2:
879 can be fit into 51 0 times, resulting in a remainder of 51.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 51, we end up with 51.
Bring next digit (5) of the dividend behind the 51 and repeat the process: 515 / 879

Advancing to step 3:
The number 879 fits into 515 0 times, leaving a remainder of 515.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 515 after subtracting 0 from 515.
Append the next digit (0) from the dividend to 515 and continue with: 5150 / 879

Going ahead to step 4:
The number 879 fits into 5150 5 times, leaving a remainder of 755.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
If we subtract 4395 from 5150, we get 755.
Append the next digit (4) from the dividend to 755 and continue with: 7554 / 879

Going ahead to step 5:
The number 879 fits into 7554 8 times, leaving a remainder of 522.
Record the quotient 8 as the next digit in the result. 
Result so far: 58.0
If we subtract 7032 from 7554, we get 522.
Include the next digit (4) from the dividend after 522, then repeat: 5224 / 879

On to step 6:
When dividing 5224 by 879, we get 5 with a remainder of 829.
Use 5 as the next digit of our solution. 
Result so far: 585.0
Deduct 4395 from 5224 and we're left with 829.
Bring next digit (5) of the dividend behind the 829 and repeat the process: 8295 / 879

Moving on to step 7:
If we divide 8295 by 879, we get 9 and a remainder of 384.
Record the quotient 9 as the next digit in the result. 
Result so far: 5859.0
If we subtract 7911 from 8295, we get 384.
Fetch the next digit (7) from the dividend, attach it to 384 and continue: 3847 / 879

Let's proceed to step 8:
3847 divided by 879 is 4 with a remainder of 331.
Put 4 as the next digit of the answer. 
Result so far: 58594.0
The remainder is 331 after subtracting 3516 from 3847.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3310, and continue the process.

On to step 9:
If we divide 3310 by 879, we get 3 and a remainder of 673.
Record the quotient 3 as the next digit in the result. 
Result so far: 58594.3
Subtract 2637 from 3310 to get 673.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6730, and continue the process.

Advancing to step 10:
If we divide 6730 by 879, we get 7 and a remainder of 577.
The next digit of our result is 7. 
Result so far: 58594.37
Subtracting 6153 from 6730 leaves us with 577.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5770, and continue the process.

Moving on to step 11:
879 can be fit into 5770 6 times, resulting in a remainder of 496.
Use 6 as the next digit of our solution. 
Result so far: 58594.376
If we subtract 5274 from 5770, we get 496.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4960, and continue the process.

Advancing to step 12:
879 can be fit into 4960 5 times, resulting in a remainder of 565.
Put 5 as the next digit of the answer. 
Result so far: 58594.3765
If we subtract 4395 from 4960, we get 565.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5650, and continue the process.

Going ahead to step 13:
If we divide 5650 by 879, we get 6 and a remainder of 376.
Use 6 as the next digit of our solution. 
Result so far: 58594.37656
Deduct 5274 from 5650 and we're left with 376.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3760, and continue the process.

On to step 14:
When dividing 3760 by 879, we get 4 with a remainder of 244.
Put 4 as the next digit of the answer. 
Result so far: 58594.376564
Deduct 3516 from 3760 and we're left with 244.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2440, and continue the process.

Step 15:
The number 879 fits into 2440 2 times, leaving a remainder of 682.
Use 2 as the next digit of our solution. 
Result so far: 58594.3765642
The remainder is 682 after subtracting 1758 from 2440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6820, and continue the process.

Moving on to step 16:
879 can be fit into 6820 7 times, resulting in a remainder of 667.
Write down 7 as next digit of the result. 
Result so far: 58594.37656427
If we subtract 6153 from 6820, we get 667.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6670, and continue the process.

The final outcome is 58594.37656427, with a leftover of 6.67e-07.