We look at the division of 73521 by 4 
We want to figure out the number of times 73521 can be divided by 4.

Going ahead to step 1:
4 can be fit into 7 1 times, resulting in a remainder of 3.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 4 from 7 to get 3.
Append the next digit (3) from the dividend to 3 and continue with: 33 / 4

Going ahead to step 2:
33 divided by 4 is 8 with a remainder of 1.
Write down 8 as next digit of the result. 
Result so far: 18.0
Subtract 32 from 33 to get 1.
Take the next digit (5) from the dividend and append it to 1, then repeat: 15 / 4

Advancing to step 3:
If we divide 15 by 4, we get 3 and a remainder of 3.
Use 3 as the next digit of our solution. 
Result so far: 183.0
The remainder is 3 after subtracting 12 from 15.
Fetch the next digit (2) from the dividend, attach it to 3 and continue: 32 / 4

On to step 4:
If we divide 32 by 4, we get 8 and a remainder of 0.
The next digit of our result is 8. 
Result so far: 1838.0
The remainder is 0 after subtracting 32 from 32.
Append the next digit (1) from the dividend to 0 and continue with: 1 / 4

Step 5:
If we divide 1 by 4, we get 0 and a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 18380.0
The remainder is 1 after subtracting 0 from 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 6:
4 goes into 10 2 times with a remainder of 2.
Put 2 as the next digit of the answer. 
Result so far: 18380.2
If we take 8 away from 10, we end up 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.

Advancing to step 7:
20 divided by 4 is 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 18380.25
If we take 20 away from 20, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 8:
4 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 18380.25
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 9:
4 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 18380.25
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 18380.25 and a remainder of 0.0.