Let's divide 5210985 by 409
Our goal is to divide 5210985 by 409.

On to step 1:
If we divide 5 by 409, we get 0 and a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Take the next digit (2) from the dividend and append it to 5, then repeat: 52 / 409

On to step 2:
When dividing 52 by 409, we get 0 with a remainder of 52.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 52, we get 52.
Fetch the next digit (1) from the dividend, attach it to 52 and continue: 521 / 409

Advancing to step 3:
When dividing 521 by 409, we get 1 with a remainder of 112.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 409 from 521, we get 112.
Fetch the next digit (0) from the dividend, attach it to 112 and continue: 1120 / 409

Going ahead to step 4:
409 can be fit into 1120 2 times, resulting in a remainder of 302.
Use 2 as the next digit of our solution. 
Result so far: 12.0
If we take 818 away from 1120, we end up with 302.
Take the next digit (9) from the dividend and append it to 302, then repeat: 3029 / 409

On to step 5:
409 can be fit into 3029 7 times, resulting in a remainder of 166.
The next digit of our result is 7. 
Result so far: 127.0
Deduct 2863 from 3029 and we're left with 166.
Take the next digit (8) from the dividend and append it to 166, then repeat: 1668 / 409

Let's proceed to step 6:
1668 divided by 409 is 4 with a remainder of 32.
Record the quotient 4 as the next digit in the result. 
Result so far: 1274.0
Deduct 1636 from 1668 and we're left with 32.
Append the next digit (5) from the dividend to 32 and continue with: 325 / 409

Advancing to step 7:
If we divide 325 by 409, we get 0 and a remainder of 325.
Put 0 as the next digit of the answer. 
Result so far: 12740.0
Subtract 0 from 325 to get 325.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3250, and continue the process.

Moving on to step 8:
The number 409 fits into 3250 7 times, leaving a remainder of 387.
Record the quotient 7 as the next digit in the result. 
Result so far: 12740.7
Subtracting 2863 from 3250 leaves us with 387.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3870, and continue the process.

Going ahead to step 9:
If we divide 3870 by 409, we get 9 and a remainder of 189.
Use 9 as the next digit of our solution. 
Result so far: 12740.79
Subtracting 3681 from 3870 leaves us with 189.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1890, and continue the process.

Step 10:
409 goes into 1890 4 times with a remainder of 254.
Put 4 as the next digit of the answer. 
Result so far: 12740.794
The remainder is 254 after subtracting 1636 from 1890.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2540, and continue the process.

Advancing to step 11:
409 can be fit into 2540 6 times, resulting in a remainder of 86.
The next digit of our result is 6. 
Result so far: 12740.7946
Subtract 2454 from 2540 to get 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Let's proceed to step 12:
If we divide 860 by 409, we get 2 and a remainder of 42.
Record the quotient 2 as the next digit in the result. 
Result so far: 12740.79462
If we subtract 818 from 860, we get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Going ahead to step 13:
When dividing 420 by 409, we get 1 with a remainder of 11.
Record the quotient 1 as the next digit in the result. 
Result so far: 12740.794621
If we take 409 away from 420, we end up with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Let's proceed to step 14:
If we divide 110 by 409, we get 0 and a remainder of 110.
The next digit of our result is 0. 
Result so far: 12740.794621
If we take 0 away from 110, we end up with 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Step 15:
If we divide 1100 by 409, we get 2 and a remainder of 282.
The next digit of our result is 2. 
Result so far: 12740.79462102
Subtracting 818 from 1100 leaves us with 282.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2820, and continue the process.

After the division, we end up with 12740.79462102 and a remainder of 2.82e-07.