Start saving those water bottle lids: Math Facts Race, a great, engaging math activity that can be changed to accommodate lower to higher math learners. AND, you can fit it to engage middle and high school students.
Just a very simple idea for quieter sessions. Pom poms are so quiet. Children get the pom-poms with chopsticks or tweezers. good for counting sorting and fine manipulative. Can be done individually or they could choose a number then race to collect.