Bring spooky fun into your math classroom with this Halloween rounding mystery! Your students will become detectives in The Case of the Missing Monster Mash Cupcakes, using their place value skills to round multi-digit numbers and uncover the guilty cupcake thief.

This activity is perfect for reviewing 4.NBT.3: rounding multi-digit whole numbers to any place. Students solve 10 rounding problems, and each correct answer eliminates one suspect from the Halloween lineup. By the end, the class uncovers the culprit (Skeleton Sam!) and celebrates a sweet, math-powered victory.

👻 What’s Included:

• Teacher Guide with Common Core correlation and "I Can" printable poster.
• Engaging Halloween mystery story introduction + conclusion
• 10 silly suspects with illustrated photo lineup
• 10 multi-digit rounding questions (tens, hundreds, thousands, ten thousands, hundred thousands)
• Student detective recording sheet to track suspects
• Complete answer key for teacher use
• Optional Extension Activity

✨ Why Teachers Love It:

• Makes rounding practice fun and memorable
• Ready-to-use, print-and-go format- no prep required!
• Encourages critical thinking and problem-solving
• Perfect for whole-class, small group, or independent practice
  

🎯 Standards Alignment:

• CCSS.MATH.CONTENT.4.NBT.A.3 – Use place value understanding to round multi-digit whole numbers to any place.
  

This Halloween math mystery is classroom-tested to keep students laughing, learning, and hooked on rounding!

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