52125105 ÷ 209 
We want to figure out the number of times 52125105 can be divided by 209.

On to step 1:
If we divide 5 by 209, we get 0 and a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Fetch the next digit (2) from the dividend, attach it to 5 and continue: 52 / 209

On to step 2:
209 goes into 52 0 times with a remainder of 52.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 52 after subtracting 0 from 52.
Take the next digit (1) from the dividend and append it to 52, then repeat: 521 / 209

On to step 3:
If we divide 521 by 209, we get 2 and a remainder of 103.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Subtract 418 from 521 to get 103.
Take the next digit (2) from the dividend and append it to 103, then repeat: 1032 / 209

Going ahead to step 4:
1032 divided by 209 is 4 with a remainder of 196.
The next digit of our result is 4. 
Result so far: 24.0
If we subtract 836 from 1032, we get 196.
Fetch the next digit (5) from the dividend, attach it to 196 and continue: 1965 / 209

Step 5:
The number 209 fits into 1965 9 times, leaving a remainder of 84.
Put 9 as the next digit of the answer. 
Result so far: 249.0
Subtract 1881 from 1965 to get 84.
Include the next digit (1) from the dividend after 84, then repeat: 841 / 209

On to step 6:
209 goes into 841 4 times with a remainder of 5.
The next digit of our result is 4. 
Result so far: 2494.0
The remainder is 5 after subtracting 836 from 841.
Take the next digit (0) from the dividend and append it to 5, then repeat: 50 / 209

Step 7:
The number 209 fits into 50 0 times, leaving a remainder of 50.
The next digit of our result is 0. 
Result so far: 24940.0
If we subtract 0 from 50, we get 50.
Bring next digit (5) of the dividend behind the 50 and repeat the process: 505 / 209

Advancing to step 8:
The number 209 fits into 505 2 times, leaving a remainder of 87.
Write down 2 as next digit of the result. 
Result so far: 249402.0
Deduct 418 from 505 and we're left with 87.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

On to step 9:
If we divide 870 by 209, we get 4 and a remainder of 34.
Put 4 as the next digit of the answer. 
Result so far: 249402.4
Subtracting 836 from 870 leaves us with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Let's proceed to step 10:
209 can be fit into 340 1 times, resulting in a remainder of 131.
The number 1 becomes the next digit in our result. 
Result so far: 249402.41
If we subtract 209 from 340, we get 131.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1310, and continue the process.

On to step 11:
When dividing 1310 by 209, we get 6 with a remainder of 56.
Write down 6 as next digit of the result. 
Result so far: 249402.416
Subtracting 1254 from 1310 leaves us with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Advancing to step 12:
When dividing 560 by 209, we get 2 with a remainder of 142.
Write down 2 as next digit of the result. 
Result so far: 249402.4162
If we subtract 418 from 560, we get 142.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1420, and continue the process.

Step 13:
When dividing 1420 by 209, we get 6 with a remainder of 166.
Put 6 as the next digit of the answer. 
Result so far: 249402.41626
Subtract 1254 from 1420 to get 166.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1660, and continue the process.

Moving on to step 14:
When dividing 1660 by 209, we get 7 with a remainder of 197.
Write down 7 as next digit of the result. 
Result so far: 249402.416267
If we subtract 1463 from 1660, we get 197.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1970, and continue the process.

Moving on to step 15:
If we divide 1970 by 209, we get 9 and a remainder of 89.
Put 9 as the next digit of the answer. 
Result so far: 249402.4162679
Deduct 1881 from 1970 and we're left with 89.
Since there are no more digits in the dividend, we add a zero to the remainder making it 890, and continue the process.

Advancing to step 16:
209 can be fit into 890 4 times, resulting in a remainder of 54.
Use 4 as the next digit of our solution. 
Result so far: 249402.41626794
Deduct 836 from 890 and we're left with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

The quotient of the division is 249402.41626794, and the remainder is 5.4e-08.