Activities about prime numbers

Lunar New Year 2026

The 2026 Lunar New Year falls on Tuesday, February 17. In this updated activity, students will explore the unique naming system of the Lunar New Year, which combines...

Number Sense Holidays and Annual Events Grades 4–7

Want to earn $150,000? - Mersenne prime search

What's a Mersenne prime? How hard could it be to find the next one? Why are there only 50 known Mersenne primes? What's with $150,000?

Algebra Number Sense Grades 5–HS

Cicada swarmaggedon

Most of the life cycle of the Magicicada Septendecim is spent underground. Then at 17 year intervals, these cicadas emerge from the ground, climb deciduous trees, molt into...

Algebra Number Sense Grades 4–7