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All for the Boys - for "building week" a bunch of great Lego activities around math & spatial/shape recognition
Magnetic number Fishing. They add what they catch.
Free Printable for Duplo Block Patterns #printable
jumbo craft sticks with magnet strips. Use them for color or number sorting paper clips.
Math ideas and printables (patterning)
Even more designs for painted Popsicle sticks
Popsicle Stick Patterns - Problem Solving
Building Shapes Popsicle Sticks Busy Bag by KeepingMyKiddoBusy