21030028 ÷ 902 
Let's see how many times 902 fits into 21030028.

Advancing to step 1:
902 can be fit into 2 0 times, resulting in a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 902

Advancing to step 2:
21 divided by 902 is 0 with a remainder of 21.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 21 to get 21.
Bring next digit (0) of the dividend behind the 21 and repeat the process: 210 / 902

Advancing to step 3:
The number 902 fits into 210 0 times, leaving a remainder of 210.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 210 after subtracting 0 from 210.
Take the next digit (3) from the dividend and append it to 210, then repeat: 2103 / 902

Step 4:
If we divide 2103 by 902, we get 2 and a remainder of 299.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtracting 1804 from 2103 leaves us with 299.
Include the next digit (0) from the dividend after 299, then repeat: 2990 / 902

Step 5:
When dividing 2990 by 902, we get 3 with a remainder of 284.
Write down 3 as next digit of the result. 
Result so far: 23.0
Subtracting 2706 from 2990 leaves us with 284.
Take the next digit (0) from the dividend and append it to 284, then repeat: 2840 / 902

On to step 6:
The number 902 fits into 2840 3 times, leaving a remainder of 134.
Record the quotient 3 as the next digit in the result. 
Result so far: 233.0
The remainder is 134 after subtracting 2706 from 2840.
Append the next digit (2) from the dividend to 134 and continue with: 1342 / 902

Advancing to step 7:
When dividing 1342 by 902, we get 1 with a remainder of 440.
Record the quotient 1 as the next digit in the result. 
Result so far: 2331.0
Subtract 902 from 1342 to get 440.
Bring next digit (8) of the dividend behind the 440 and repeat the process: 4408 / 902

Advancing to step 8:
902 can be fit into 4408 4 times, resulting in a remainder of 800.
Put 4 as the next digit of the answer. 
Result so far: 23314.0
Subtract 3608 from 4408 to get 800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8000, and continue the process.

Moving on to step 9:
The number 902 fits into 8000 8 times, leaving a remainder of 784.
Write down 8 as next digit of the result. 
Result so far: 23314.8
Subtract 7216 from 8000 to get 784.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7840, and continue the process.

Let's proceed to step 10:
7840 divided by 902 is 8 with a remainder of 624.
Write down 8 as next digit of the result. 
Result so far: 23314.88
Deduct 7216 from 7840 and we're left with 624.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6240, and continue the process.

After the division, we end up with 23314.88 and a remainder of 0.624.