We went entirely backwards from our usual schedule today with the hope of finishing our comparing numbers unit for the end of the month. We were successful, yay! We worked through comparing numbers up to 20 with the terms "greater than" "less than" and "equal to". I still use lots of words to make sure the vocabulary is sticking. For example, I say something like, "Which is greater, 13 or 15? Which number is the biggest number?" Remember that in preschool we're aiming for an introduction to topics, not mastery. They have years to master this stuff.