We look at the division of 721525 by 42 
We want to figure out the number of times 721525 can be divided by 42.

Going ahead to step 1:
The number 42 fits into 7 0 times, leaving a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Take the next digit (2) from the dividend and append it to 7, then repeat: 72 / 42

Let's proceed to step 2:
When dividing 72 by 42, we get 1 with a remainder of 30.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 30 after subtracting 42 from 72.
Bring next digit (1) of the dividend behind the 30 and repeat the process: 301 / 42

On to step 3:
42 goes into 301 7 times with a remainder of 7.
The number 7 becomes the next digit in our result. 
Result so far: 17.0
If we take 294 away from 301, we end up with 7.
Bring next digit (5) of the dividend behind the 7 and repeat the process: 75 / 42

Let's proceed to step 4:
75 divided by 42 is 1 with a remainder of 33.
Use 1 as the next digit of our solution. 
Result so far: 171.0
Subtracting 42 from 75 leaves us with 33.
Bring next digit (2) of the dividend behind the 33 and repeat the process: 332 / 42

Advancing to step 5:
42 can be fit into 332 7 times, resulting in a remainder of 38.
Record the quotient 7 as the next digit in the result. 
Result so far: 1717.0
The remainder is 38 after subtracting 294 from 332.
Bring next digit (5) of the dividend behind the 38 and repeat the process: 385 / 42

Let's proceed to step 6:
The number 42 fits into 385 9 times, leaving a remainder of 7.
Use 9 as the next digit of our solution. 
Result so far: 17179.0
Subtracting 378 from 385 leaves us with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Step 7:
If we divide 70 by 42, we get 1 and a remainder of 28.
Write down 1 as next digit of the result. 
Result so far: 17179.1
The remainder is 28 after subtracting 42 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Step 8:
When dividing 280 by 42, we get 6 with a remainder of 28.
Record the quotient 6 as the next digit in the result. 
Result so far: 17179.16
Subtracting 252 from 280 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 9:
When dividing 280 by 42, we get 6 with a remainder of 28.
The next digit of our result is 6. 
Result so far: 17179.166
Subtracting 252 from 280 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.

In conclusion, the division gives 17179.166 with a balance of 0.0028.