Take a look at some number problems from ancient India...
What better way to learn about primes and periodic curves than to play with visualizations of them?
Here is a resource on factorization that is bound to capture the attention of your students. You can show your students a few and see what they come up with on their own too!
Want a teaser for yourself (or your learners) on topic
Swati, at Shikshamitra, demonstrates how exponential identities can be explained in a visual, child-friendly manner.
When children enjoy coming to school, you know the teachers are doing something right.