Jack has the best blocks ever. They come in all shapes (square, rectangle, cylinders, cones) and colors. In Jack’s imagination, an arrangement of just two blocks is a robot. Add one more block and presto! It’s a hot dog stand at the circus. Add two more blocks for a total of five for a ferryboat. And so it goes, counting on more and more blocks, all the way to the super-duper, ready-for-lift-off rocket ship. Blast off! All the blocks fall down and it’s time for Jack to start over again. Counting on is a strategy to help young children understand how to solve addition problems. Used with permission from Stuart J. Murphy.