2-Digit Addition with Regrouping

Inside the case file

Two digit addition with regrouping worksheets, double digit addition without regrouping practice, and column addition activities for 2nd grade and 3rd grade are all included in this printable pirate Mini Mystery Detective pack of math worksheets. Five detective cases play out aboard a pirate ship, so it drops straight into Talk Like a Pirate Day on September 19, a pirate theme week, a treasure hunt or buried gold unit, a Treasure Island or pirate book study, an ocean and under the sea topic, or Halloween week when you want swashbuckling adventure instead of something spooky. No cutting, no gluing, no technology, and completely no prep - just print and go.

The five cases climb. The first is plain two digit addition with no carrying at all, the middle cases start regrouping the ones into a ten, and the last two push the answers past 100 so students carry twice. That gives you a whole differentiated ladder inside one pack - the same mystery for the group still learning to line up the columns and the group ready to cross a hundred. Black and white, ink friendly, PDF, with a full answer key for every case.

What's Inside

• Adding two 2-digit numbers with no regrouping, so the column method is secure before any carrying starts
• Pages that mix carrying and non-carrying problems, so students have to look at each column instead of carrying out of habit
• Regrouping the ones into a ten on every problem, the classic two digit addition with regrouping page
• Regrouping the tens into a hundred where the ones column never carries - the case that catches out anyone who learned carry when you add
• Both columns regrouping, with sums well past 100
• Lining digits up by place value in a vertical column addition layout
• Full answer keys for every case

Five cases to crack: The Empty Gold Chest, The Stolen Wheel, The Vanished Parrot, The Bare Flagpole and The Silent Cannon.

What is a Mini Mystery Detective?

A no-prep detective activity where students solve math problems to cross off suspects and unmask the culprit. Skill practice plus critical thinking in one engaging, self-checking worksheet set - an escape room without the locks, boxes or setup.

When to Use This Resource

• Talk Like a Pirate Day on September 19
• Pirate theme weeks, treasure hunts and buried gold units
• Treasure Island and pirate book studies
• Halloween week, when you want adventure rather than spooky
• Summer, ocean and under the sea topics
• Two digit addition and place value units
• Math centers, stations and rotations
• Morning work and bell ringers
• Fast finishers and independent work
• Sub days - a substitute can hand it out cold
• Homework and extra practice
• Small group, RTI and intervention
• Spiral review, test prep and end-of-year revision

Grade Levels

Designed for 2nd grade and 3rd grade. Because the cases climb from no carrying to carrying twice, the same pack supports a 1st grader who has just met the column method and stretches a 4th grader who needs the regrouping drilled before moving on to bigger numbers. Nothing has to be read to be solved, which makes it work for ELL and ESL students and for special education, RTI and intervention groups.

Why Teachers Love Mystery Detectives

• Zero prep - print and hand out. No cutting, no gluing, no technology, no laminating
• The pages check themselves - a wrong answer stops the mystery in its tracks, so students go back and find their own mistake before it ever reaches your marking pile
• The detective hook keeps students working through a full page of addition
• The climbing difficulty means one pack covers your whole range, so nobody is bored and nobody is lost
• Black and white and ink friendly - it photocopies cleanly
• Answer keys that make marking a few seconds a page

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