Back to School Math Review | GCF and LCM Secret Message

Reviewing least common multiple (LCM) and greatest common factor (GCF) can be… let’s be honest… a little dry if students are just grinding through worksheets. That’s why I love adding a bit of mystery and gamification to math review — it keeps students engaged and coming back for more.

One of my favorite ways to do this is with digital secret message activities. Students solve a series of math problems, and with each correct answer, they reveal part of a hidden phrase. By the end, they’ve cracked the code and reviewed key skills without even realizing how much practice they’ve done.

Your Free LCM & GCF Secret Message Activity

In this free digital activity, your students will:

• Solve 11 problems on least common multiple and greatest common factor
• Receive instant feedback with self-checking pages
• Work independently (perfect for centers, homework, or distance learning)
• Reveal a fun hidden message as they progress

It’s completely no prep — just share the link and let them start. There are no locks to configure, no extra accounts to set up, and it works without Google Classroom or Microsoft Teams logins.

You can use it for:

• Back-to-school skill refreshers
• End-of-year review
• Early finishers
• Math centers
• At-home practice

Want More Review Activities Like This?

If your students love this style of interactive review, they’ll go crazy for my 6th Grade Math Back to School Digital Choice Board.

This no-prep choice board includes 15 topics — everything from factors & multiples to ratios, exponents, coordinate planes, equations, inequalities, and more. Each activity is designed to be self-paced, engaging, and confidence-building right from the first week of school.

It’s ideal for:

• Back-to-school review
• Sub plans
• Small group work or stations
• Independent enrichment or intervention

With printable worksheets and answer keys included, you’ll have flexible options for any classroom setup.

🎁 Grab your free LCM & GCF secret message activity to get started — and when you’re ready to keep the engagement going across all major 6th grade topics, check out the full Back to School Choice Board bundle.