Is 7.09 greater than 7.2

No.

Since the number in the ones place is the same for both numbers (7), we can go ahead and look at the decimal places.

Lets take a look at the decimal places:

7.09 has a zero in the tenths place.

7.2 has a 2 in the tenths place.

2 is greater than 0so, in this case 7.2 is greater than 7.09.

If you don't understand anything let me know. I will be happy to clarify.