Learning Resources Counting Dino-Sorters Maths Activity Set. This fun, hands-on, dinosaur themed sorting activity set supports a variety of early maths skills such as colour recognition, matching, sorting and counting within young learners. Includes ten two-piece, plastic dinosaur eggs numbered one to ten, 55 Back in Time Dinosaur counters and multlingual Activity Guide. Eggs measure 7.5cm H when whole. Suitable for ages 3+.