We're dividing 121528 by 75 
We want to figure out the number of times 121528 can be divided by 75.

Step 1:
75 goes into 1 0 times with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Include the next digit (2) from the dividend after 1, then repeat: 12 / 75

On to step 2:
75 goes into 12 0 times with a remainder of 12.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 12 to get 12.
Include the next digit (1) from the dividend after 12, then repeat: 121 / 75

Let's proceed to step 3:
If we divide 121 by 75, we get 1 and a remainder of 46.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 75 from 121 leaves us with 46.
Include the next digit (5) from the dividend after 46, then repeat: 465 / 75

Step 4:
75 can be fit into 465 6 times, resulting in a remainder of 15.
The next digit of our result is 6. 
Result so far: 16.0
Subtract 450 from 465 to get 15.
Fetch the next digit (2) from the dividend, attach it to 15 and continue: 152 / 75

Step 5:
The number 75 fits into 152 2 times, leaving a remainder of 2.
Put 2 as the next digit of the answer. 
Result so far: 162.0
Subtract 150 from 152 to get 2.
Fetch the next digit (8) from the dividend, attach it to 2 and continue: 28 / 75

Step 6:
75 goes into 28 0 times with a remainder of 28.
Write down 0 as next digit of the result. 
Result so far: 1620.0
Subtracting 0 from 28 leaves us with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

On to step 7:
280 divided by 75 is 3 with a remainder of 55.
The next digit of our result is 3. 
Result so far: 1620.3
If we take 225 away from 280, we end up with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Advancing to step 8:
75 goes into 550 7 times with a remainder of 25.
Write down 7 as next digit of the result. 
Result so far: 1620.37
If we take 525 away from 550, we end up with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Advancing to step 9:
75 can be fit into 250 3 times, resulting in a remainder of 25.
Record the quotient 3 as the next digit in the result. 
Result so far: 1620.373
If we take 225 away from 250, we end up with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Step 10:
75 goes into 250 3 times with a remainder of 25.
Record the quotient 3 as the next digit in the result. 
Result so far: 1620.3733
Subtracting 225 from 250 leaves us with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

The final outcome is 1620.3733, with a leftover of 0.00025.