81224965 ÷ 538 
We want to figure out the number of times 81224965 can be divided by 538.

Let's proceed to step 1:
When dividing 8 by 538, we get 0 with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Bring next digit (1) of the dividend behind the 8 and repeat the process: 81 / 538

Let's proceed to step 2:
538 goes into 81 0 times with a remainder of 81.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 81 and we're left with 81.
Append the next digit (2) from the dividend to 81 and continue with: 812 / 538

On to step 3:
538 goes into 812 1 times with a remainder of 274.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 538 from 812 and we're left with 274.
Include the next digit (2) from the dividend after 274, then repeat: 2742 / 538

Advancing to step 4:
2742 divided by 538 is 5 with a remainder of 52.
Put 5 as the next digit of the answer. 
Result so far: 15.0
Deduct 2690 from 2742 and we're left with 52.
Fetch the next digit (4) from the dividend, attach it to 52 and continue: 524 / 538

Step 5:
When dividing 524 by 538, we get 0 with a remainder of 524.
Use 0 as the next digit of our solution. 
Result so far: 150.0
If we take 0 away from 524, we end up with 524.
Append the next digit (9) from the dividend to 524 and continue with: 5249 / 538

Going ahead to step 6:
538 goes into 5249 9 times with a remainder of 407.
Write down 9 as next digit of the result. 
Result so far: 1509.0
The remainder is 407 after subtracting 4842 from 5249.
Include the next digit (6) from the dividend after 407, then repeat: 4076 / 538

Moving on to step 7:
The number 538 fits into 4076 7 times, leaving a remainder of 310.
The number 7 becomes the next digit in our result. 
Result so far: 15097.0
Deduct 3766 from 4076 and we're left with 310.
Include the next digit (5) from the dividend after 310, then repeat: 3105 / 538

Step 8:
If we divide 3105 by 538, we get 5 and a remainder of 415.
Put 5 as the next digit of the answer. 
Result so far: 150975.0
If we subtract 2690 from 3105, we get 415.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4150, and continue the process.

On to step 9:
If we divide 4150 by 538, we get 7 and a remainder of 384.
Record the quotient 7 as the next digit in the result. 
Result so far: 150975.7
If we take 3766 away from 4150, we end up with 384.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3840, and continue the process.

On to step 10:
538 goes into 3840 7 times with a remainder of 74.
Write down 7 as next digit of the result. 
Result so far: 150975.77
The remainder is 74 after subtracting 3766 from 3840.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

The final outcome is 150975.77, with a leftover of 0.074.