52480286 ÷ 21 
We want to divide 52480286 by 21.

Moving on to step 1:
The number 21 fits into 5 0 times, leaving a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Append the next digit (2) from the dividend to 5 and continue with: 52 / 21

Let's proceed to step 2:
21 can be fit into 52 2 times, resulting in a remainder of 10.
The next digit of our result is 2. 
Result so far: 2.0
If we take 42 away from 52, we end up with 10.
Take the next digit (4) from the dividend and append it to 10, then repeat: 104 / 21

Going ahead to step 3:
The number 21 fits into 104 4 times, leaving a remainder of 20.
Record the quotient 4 as the next digit in the result. 
Result so far: 24.0
The remainder is 20 after subtracting 84 from 104.
Bring next digit (8) of the dividend behind the 20 and repeat the process: 208 / 21

On to step 4:
The number 21 fits into 208 9 times, leaving a remainder of 19.
Use 9 as the next digit of our solution. 
Result so far: 249.0
The remainder is 19 after subtracting 189 from 208.
Append the next digit (0) from the dividend to 19 and continue with: 190 / 21

Going ahead to step 5:
21 goes into 190 9 times with a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 2499.0
Deduct 189 from 190 and we're left with 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 21

Let's proceed to step 6:
If we divide 12 by 21, we get 0 and a remainder of 12.
The number 0 becomes the next digit in our result. 
Result so far: 24990.0
If we take 0 away from 12, we end up with 12.
Take the next digit (8) from the dividend and append it to 12, then repeat: 128 / 21

Step 7:
If we divide 128 by 21, we get 6 and a remainder of 2.
The next digit of our result is 6. 
Result so far: 249906.0
The remainder is 2 after subtracting 126 from 128.
Append the next digit (6) from the dividend to 2 and continue with: 26 / 21

Moving on to step 8:
When dividing 26 by 21, we get 1 with a remainder of 5.
Put 1 as the next digit of the answer. 
Result so far: 2499061.0
Subtracting 21 from 26 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 9:
50 divided by 21 is 2 with a remainder of 8.
The next digit of our result is 2. 
Result so far: 2499061.2
Subtract 42 from 50 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 10:
If we divide 80 by 21, we get 3 and a remainder of 17.
The next digit of our result is 3. 
Result so far: 2499061.23
Subtracting 63 from 80 leaves us with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Step 11:
170 divided by 21 is 8 with a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 2499061.238
Deduct 168 from 170 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 12:
If we divide 20 by 21, we get 0 and a remainder of 20.
The next digit of our result is 0. 
Result so far: 2499061.238
Deduct 0 from 20 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 13:
The number 21 fits into 200 9 times, leaving a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 2499061.23809
Deduct 189 from 200 and we're left 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.

Moving on to step 14:
If we divide 110 by 21, we get 5 and a remainder of 5.
The next digit of our result is 5. 
Result so far: 2499061.238095
If we take 105 away from 110, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 15:
When dividing 50 by 21, we get 2 with a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 2499061.2380952
If we subtract 42 from 50, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 16:
21 goes into 80 3 times with a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 2499061.23809523
If we subtract 63 from 80, we get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

The final outcome is 2499061.23809523, with a leftover of 1.7e-08.