Conversation hearts can be used for fun learning activities. Here are many ideas for Valentine's Day activities for preschool. Includes a free printable graphing page. Use the Valentine's Day candy hearts for math, numeracy, literacy, color, and patterning activities. So many ways for hands'on learning for your Valentine's Day theme unit or lesson plans. Perfect for preschool, pre-k, and kindergarten learning centers, learning stations, math centers, math tubs or Valentine's Day party games.