900042 ÷ 72 
We're looking to find how many times 72 goes into 900042.

Step 1:
When dividing 9 by 72, we get 0 with a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Grab the next digit (0) from the dividend, add it to 9, then carry on: 90 / 72

On to step 2:
72 can be fit into 90 1 times, resulting in a remainder of 18.
The next digit of our result is 1. 
Result so far: 1.0
If we subtract 72 from 90, we get 18.
Append the next digit (0) from the dividend to 18 and continue with: 180 / 72

On to step 3:
If we divide 180 by 72, we get 2 and a remainder of 36.
The number 2 becomes the next digit in our result. 
Result so far: 12.0
Subtract 144 from 180 to get 36.
Grab the next digit (0) from the dividend, add it to 36, then carry on: 360 / 72

Going ahead to step 4:
72 can be fit into 360 5 times, resulting in a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 125.0
Subtract 360 from 360 to get 0.
Take the next digit (4) from the dividend and append it to 0, then repeat: 4 / 72

Step 5:
72 can be fit into 4 0 times, resulting in a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 1250.0
If we take 0 away from 4, we end up with 4.
Include the next digit (2) from the dividend after 4, then repeat: 42 / 72

Going ahead to step 6:
The number 72 fits into 42 0 times, leaving a remainder of 42.
Put 0 as the next digit of the answer. 
Result so far: 12500.0
Subtract 0 from 42 to get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Advancing to step 7:
The number 72 fits into 420 5 times, leaving a remainder of 60.
Write down 5 as next digit of the result. 
Result so far: 12500.5
If we take 360 away from 420, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Going ahead to step 8:
The number 72 fits into 600 8 times, leaving a remainder of 24.
Use 8 as the next digit of our solution. 
Result so far: 12500.58
Deduct 576 from 600 and we're left with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Going ahead to step 9:
If we divide 240 by 72, we get 3 and a remainder of 24.
The next digit of our result is 3. 
Result so far: 12500.583
Subtracting 216 from 240 leaves us with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Advancing to step 10:
If we divide 240 by 72, we get 3 and a remainder of 24.
Use 3 as the next digit of our solution. 
Result so far: 12500.5833
If we take 216 away from 240, we end up with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

The final result is 12500.5833 with a remainder of 0.00024.