51621810 ÷ 979 
We want to figure out the number of times 51621810 can be divided by 979.

Step 1:
979 goes into 5 0 times with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Grab the next digit (1) from the dividend, add it to 5, then carry on: 51 / 979

Advancing to step 2:
When dividing 51 by 979, we get 0 with a remainder of 51.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 51, we get 51.
Fetch the next digit (6) from the dividend, attach it to 51 and continue: 516 / 979

Moving on to step 3:
The number 979 fits into 516 0 times, leaving a remainder of 516.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 516, we get 516.
Take the next digit (2) from the dividend and append it to 516, then repeat: 5162 / 979

Moving on to step 4:
If we divide 5162 by 979, we get 5 and a remainder of 267.
The next digit of our result is 5. 
Result so far: 5.0
Subtracting 4895 from 5162 leaves us with 267.
Grab the next digit (1) from the dividend, add it to 267, then carry on: 2671 / 979

Going ahead to step 5:
979 goes into 2671 2 times with a remainder of 713.
Use 2 as the next digit of our solution. 
Result so far: 52.0
If we take 1958 away from 2671, we end up with 713.
Bring next digit (8) of the dividend behind the 713 and repeat the process: 7138 / 979

Going ahead to step 6:
979 can be fit into 7138 7 times, resulting in a remainder of 285.
Record the quotient 7 as the next digit in the result. 
Result so far: 527.0
If we take 6853 away from 7138, we end up with 285.
Bring next digit (1) of the dividend behind the 285 and repeat the process: 2851 / 979

Advancing to step 7:
If we divide 2851 by 979, we get 2 and a remainder of 893.
The next digit of our result is 2. 
Result so far: 5272.0
Subtracting 1958 from 2851 leaves us with 893.
Grab the next digit (0) from the dividend, add it to 893, then carry on: 8930 / 979

Advancing to step 8:
The number 979 fits into 8930 9 times, leaving a remainder of 119.
The number 9 becomes the next digit in our result. 
Result so far: 52729.0
The remainder is 119 after subtracting 8811 from 8930.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1190, and continue the process.

Going ahead to step 9:
1190 divided by 979 is 1 with a remainder of 211.
Use 1 as the next digit of our solution. 
Result so far: 52729.1
The remainder is 211 after subtracting 979 from 1190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2110, and continue the process.

On to step 10:
979 goes into 2110 2 times with a remainder of 152.
Use 2 as the next digit of our solution. 
Result so far: 52729.12
Subtracting 1958 from 2110 leaves us with 152.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1520, and continue the process.

Let's proceed to step 11:
When dividing 1520 by 979, we get 1 with a remainder of 541.
Use 1 as the next digit of our solution. 
Result so far: 52729.121
If we take 979 away from 1520, we end up with 541.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5410, and continue the process.

On to step 12:
If we divide 5410 by 979, we get 5 and a remainder of 515.
Put 5 as the next digit of the answer. 
Result so far: 52729.1215
Subtract 4895 from 5410 to get 515.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5150, and continue the process.

Moving on to step 13:
979 can be fit into 5150 5 times, resulting in a remainder of 255.
The next digit of our result is 5. 
Result so far: 52729.12155
Subtracting 4895 from 5150 leaves us with 255.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2550, and continue the process.

After the division, we end up with 52729.12155 and a remainder of 0.000255.