3-Digit Addition & Subtraction

Inside the case file

Addition and subtraction within 1,000 summer beach Mini Mystery Detective pack of math worksheets for Grade 2, Grade 3, and Grade 4. This printable summer math resource gives students engaging 3-digit addition and subtraction practice with regrouping through beach-themed Mystery Detective cases. Students solve equations, check their answers, eliminate suspects, and solve each case in a fun escape room-style, crack-the-code activity with no locks, apps, or complicated prep required.

These addition and subtraction within 1,000 worksheets are perfect for May, June, July, August, and September math practice. Use them for summer review, summer school, end-of-year activities, back-to-school review, math centers, morning work, independent work, partner activities, small groups, homework, or test prep.

What's Included:

5 Summer Beach Mystery Detective cases:

• The Missing Beach Umbrella
• The Pool Float
• The Icecream Cart
• The Sandcastle Trophy
• The Missing Surfboard

Each case includes:

• A unique, engaging detective storyline connected to the theme
• A mix of vertical 3-digit addition and subtraction problems with answers always under 1,000
• A randomized answer list with one extra decoy to boost critical thinking
• A suspect list for students to eliminate as they solve each problem
• Teacher-friendly directions and complete answer keys
• Low-ink, easy-to-print pages for quick prep and flexible classroom use

Why Teachers Love This Resource:

• Makes math fact fluency practice exciting and interactive
• Combines problem-solving, logic, and critical thinking
• Perfect for independent work, partner activities, or small groups
• Works for back-to-school, midyear practice, and end-of-year review
• Aligned with CCSS 2.NBT.B.7, 3.NBT.A.2, Texas TEKS, and Virginia SOL math standards

Each Mystery Detective case is an independent escape room (or crack-the-code) type of activity where students solve puzzles instead of unlocking locks. Each correct answer eliminates a suspect, leading students closer to solving the case.

Please Note: This is a printable PDF file. You will receive a download link for all 5 sets. No physical product will be shipped.

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