Mentalism With Vegetable

EFFECT: The magician asks a spectator about 10 easy math problems. Like 2+2,8-5,3x3, etc. Then the spectator writes down a name of a vegetable and asks the spectator to name a vegetable. When the magician shows his prediction it matches the name of the vegetable the spectator said.
MATERIALS: You will need a pen or pencil, and a piece of paper.
METHOD: To perform this trick write on one side of the piece of paper carrot and celery on the other side of the paper. Start by asking the spectator the 10 easy math problems. When ask the spectator to name a vegetable most of the time they will say carrot if they did not name the carrot the second chance is they will say celery.