We're dividing 21253069 by 480 
We want to figure out the number of times 21253069 can be divided by 480.

Moving on to step 1:
480 can be fit into 2 0 times, resulting in a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 480

Moving on to step 2:
The number 480 fits into 21 0 times, leaving a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 21, we get 21.
Include the next digit (2) from the dividend after 21, then repeat: 212 / 480

Advancing to step 3:
If we divide 212 by 480, we get 0 and a remainder of 212.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 212, we end up with 212.
Include the next digit (5) from the dividend after 212, then repeat: 2125 / 480

Going ahead to step 4:
When dividing 2125 by 480, we get 4 with a remainder of 205.
The next digit of our result is 4. 
Result so far: 4.0
If we take 1920 away from 2125, we end up with 205.
Append the next digit (3) from the dividend to 205 and continue with: 2053 / 480

Step 5:
If we divide 2053 by 480, we get 4 and a remainder of 133.
Record the quotient 4 as the next digit in the result. 
Result so far: 44.0
Deduct 1920 from 2053 and we're left with 133.
Bring next digit (0) of the dividend behind the 133 and repeat the process: 1330 / 480

Let's proceed to step 6:
When dividing 1330 by 480, we get 2 with a remainder of 370.
The number 2 becomes the next digit in our result. 
Result so far: 442.0
If we take 960 away from 1330, we end up with 370.
Grab the next digit (6) from the dividend, add it to 370, then carry on: 3706 / 480

Moving on to step 7:
480 goes into 3706 7 times with a remainder of 346.
The next digit of our result is 7. 
Result so far: 4427.0
Subtract 3360 from 3706 to get 346.
Include the next digit (9) from the dividend after 346, then repeat: 3469 / 480

Let's proceed to step 8:
3469 divided by 480 is 7 with a remainder of 109.
The number 7 becomes the next digit in our result. 
Result so far: 44277.0
If we subtract 3360 from 3469, we get 109.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1090, and continue the process.

Moving on to step 9:
When dividing 1090 by 480, we get 2 with a remainder of 130.
The number 2 becomes the next digit in our result. 
Result so far: 44277.2
Subtract 960 from 1090 to get 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

Step 10:
1300 divided by 480 is 2 with a remainder of 340.
The number 2 becomes the next digit in our result. 
Result so far: 44277.22
Deduct 960 from 1300 and we're left with 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

Our division results in 44277.22 with a remaining 0.34.