Any kindergartner at this time of year will quickly tell you that 1 + 1 = 2, unless it’s a kindergartner who has read this fantastic book 1 + 1 = 5 and Other Unlikely Additions by David LaRochelle and illustrated by Brenda Sexton. The lucky kid who’s read this book knows that 1 + 1 can = 3 if we’re talking about the horns of 1 unicorn + 1 goat. 1 + 1 = 5 if we’re talking about babies (1 set of twins + 1 set of triplets). When does 1 + 1 = hundreds? When we’re counting the seeds in 1 pumpkin + 1 watermelon, a task that would be fun to try with your class after reading this book. Each equation will get kids thinking of combinations of sets in new ways. Challenge your students to write their own 1 + 1 = stumper. Fold a piece of paper in half lengthwise (or hot-dog-wise if you visualize it that way). Set it up so the fold is on top, like a lift-the-flap. Have students write 1 + 1 = and their unexpected number. Lift the flap and show how 1 set of things + 1 set = the combination. Your students will have a ball stumping each other and their parents. 1 great book + 1 class of cool kids = plenty of learning for them and a lot of fun for you.