Math is your friend.
Picture a recipe that calls for 1 1/2 cups of flour. You probably instinctively reach for the 1 cup measurer and the 1/2 cup measurer, right? But that dirties two dishes! Why not just fill the 1/2 cup measurer three times? Or, better yet, the 3/4 cup measurer twice?
Math can also help you in a pinch when a recipe calls for a measurement that you can't find the measuring utensil for. Can't find the tablespoon? Use three teaspoons. Need two cups of flour and can't find the 1 cup measurer? Fill the 2/3 cup three times.