I recently posted some templates to make Post-it note targets. That article features sight words on the Post-it notes, but you can actually use them to help kids learn many other concepts. Here are a few additional Post-it note activities that you can use with your kids.
Use this free printable bear color graph activity set to practice a variety of early math skills. Several math games and activity ideas are included along with many open ended questions to help kids with their numeracy skills. Kids can work on color identification, color sorting, counting, and number comparisons.