Unifix cubes are a concrete representation of addition/number bonds. Building the bond with the Unifix cubes is what develops number sense. Great use for flash cards instead of looking for just memorization
Easy and fun.Velcro + popsicle sticks make for great quiet time or restaurant activity. Put velcro dots on the ends of popsicle sticks. Kids can make letters or shapes over and over again. I found velcro dots at my local dollar store.