Sum Building Set
Appealing to children’s natural instincts to sort and collect, these durable and tactile pebbles can be used in sand and water both inside and outdoors. Each pebble is cast from a special stone and resin mix. They are engraved and hand painted with a number, making them highly appealing.
This set includes a leaflet full of ideas and activities along with two of each number 0–20, two of each operator +, – and =, one of each operator x and ÷.