Great activity with kids. Works on counting, number recognition & fine motor skills. Wasn't too hard for a 3 year old & 6 year olds really like it too. They added the difficulty of patterns to reach the right number/pipe cleaner.
Sand Mousse - sand, water and a generous amount of bubble bath - great for pre-writing skills large circles, patterns, etc using fingers and hands, with pattern making tools or small world - don't remix it with everyday sand - it goes a bit smelly! We transferred ours out to our 'Mud Kitchen'