Make adding decimals engaging and fun with this low-prep, high-interest math activity! Students will love solving problems as they work to unlock a secret code—turning practice into a game-like experience.

This resource is perfect for math centers, independent practice, review, or sub plans, while giving you meaningful insight into student understanding.

🔐 HOW IT WORKS

Students solve each adding decimals problem and select the correct answer. Each correct answer reveals a letter. When all problems are completed, students use their letters to decode a secret message!

📦 WHAT’S INCLUDED

✔ 24 Adding Decimals Task Cards
✔ Student Recording Sheet
✔ Secret Code Worksheet
✔ Answer Key
✔ Print & Go Format

✏️ SKILLS COVERED

✔ Adding decimals to the hundredths and thousandths
✔ Multi-digit decimal addition
✔ Real-world word problems
✔ Estimating decimal sums
✔ Aligning decimals and place value understanding

💡 PERFECT FOR

✔ 4th Grade Math
✔ 5th Grade Math
✔ Math Centers
✔ Small Group Instruction
✔ Independent Practice
✔ Review & Test Prep
✔ Sub Plans

⭐ WHY TEACHERS LOVE IT

✔ No prep – just print and go
✔ Self-checking – students stay accountable
✔ Highly engaging – secret code keeps students motivated
✔ Flexible use – works for centers, partners, or independent work
✔ Saves time – easy to implement and reuse

🧠 TEACHER TIP

Laminate the task cards for repeated use year after year, or use the worksheet version for a quick, no-cut option!

Make decimal practice exciting and meaningful with this interactive secret code activity your students will ask to do again and again!

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