Answer: You need to compare the ones digit, then the tenths digit
(Also, your answer to 3 is wrong, 1.24 is less than 1.3)
Explanation:
When making the comparison of 1.24 to 1.3, you can start from left to right, and once a digit is not the same, you can determine which number is greater.
In this problem, the ones digit will not help us decide, as they are both 1, but moving to the tenths digit, we can see that 1.3 has a higher tenth digit than 1.24, being 3 > 2.
Therefore, without even looking at the hundredths digit, we know that 1.3 > 1.24.