3-Digit Addition & Subtraction

Inside the case file

Summer camping 3-digit addition within 1,000 Mini Mystery Detective packs of math worksheets to engage your students at summer school, in the classroom, at home for summer vacation, or for homeschool students. Perfect for Grade 2, Grade 3, and Grade 4, this printable math activity combines 3-digit addition problems with a fun summer camp mystery where students solve equations, eliminate suspects, and reveal the culprit.

This no-prep Mini Mystery Detective is ideal for summer review, end-of-year math practice, back-to-school review, math centers, morning work, small groups, early finishers, tutoring, homeschool, or independent practice. Students will solve each 3-digit addition equation, match their answers to the suspect list, and cross off suspects until only one is left.

With a fun summer camp theme, this resource gives students a purpose for solving math problems while keeping the activity simple, structured, and easy to use. No locks, apps, cutting, or complicated setup required — just print and go!

What's Included:

• Summer camp Mystery Detective worksheet
• 3-digit addition equations within 1,000
• Suspect elimination page
• Student directions
• Answer-based mystery solving format
• Printable no-prep activity

Skills Practiced:

• 3-digit addition within 1,000
• Addition with regrouping
• Place value understanding
• Problem solving
• Accuracy and checking work
• Following directions

Perfect For:

• Grade 2 math review
• Grade 3 math practice
• Grade 4 math intervention or review
• Summer math activities
• Summer camp classroom themes
• Math centers
• Morning work
• Early finishers
• Small groups
• Sub plans
• Homeschool math practice
• End-of-year review
• Back-to-school review

Students will love becoming math detectives as they solve the summer camp mystery, eliminate suspects, and uncover who committed the crime

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