Prime Factor Fortress

Break the Composite King's army into primes to defend the fortress, with a factor tree students build by tapping.

Skills: Exponents, factor trees, prime factorization, GCF and LCM

Aligned to OAS 6.N.2.4–2.6

Common Core: 4.OA.B.4 · 6.NS.B.4 · 6.EE.A.1

Grade 6 · 1–6 players or teams · Runs in any web browser · No student logins · Works offline

Download includes the game file and a Quick Start PDF. Single-teacher license.