c) \( 2,9-0,5= \)

To solve \( 2.9 - 0.5 \), you can line up the numbers by their decimal points. Start from the right, just like you would do in a regular subtraction. Here, it gives you \( 2.4 \). So, \( 2.9 - 0.5 = 2.4 \)! Just a quick tip: When subtracting decimals, it’s often helpful to think of the numbers as whole numbers first! For instance, in this case, \( 2.9 \) can be thought of as \( 29 \) tenths, and \( 0.5 \) as \( 5 \) tenths. Subtracting \( 5 \) from \( 29 \) in tenths will help you visualize it even better!