Prime Factor Fortress

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

Grade 6Fortress defense1–6 players or teamsNo student loginsWorks offline

Try it free with your class: the demo runs right in your browser for 8 questions. No sign-up needed.

Or get every game, including all future games, with the All-Access Teacher License for $150.

What students practice

Exponents, factor trees, prime factorization, GCF and LCM

OAS 6.N.2.4–2.6

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

Open the game file in any web browser: Chromebooks, laptops or your smartboard. No accounts, no student logins and no internet needed once it's downloaded.
Enter the players or teams, then press Start.
Students take turns on one shared screen, so the whole class can play together on a projector or smartboard.
Each purchase includes the game file and a one-page Quick Start guide.