Introduce early math concepts outdoors, in the sand, or in water play with this tactile set of number rocks. With two of each number from 0-10, this sum-building set is ideal for sorting, matching, number sequencing and exploring number bonds to 10. Use them with counters, number lines and other math manipulatives to take the learning further. Each pebble measures 1.5 inches and is engraved with a numeral and hand painted for maximum durability. The handy storage jar also includes ideas for games and activities using the pebbles.