Two preschool math activities using Duplo Legos. These are great for younger brother while the older ones do their schoolwork! Identify the next number in a series of numbers up to ten. Pre-school age 3 and 4
I think you could also have multiple pipe cleaners coming from one number and students have to show multiple ways to add numbers to get to that number. Counting with pipe cleaners and beads. Great for fine motor development too.