3-Digit Addition with Regrouping

Name: 3-Digit Addition with Regrouping | Mystery Detective Worksheets | Grades 2–5 | Space Wars
Brand: Kiwiland Education
SKU: 5146262
Price: 4.5 USD
Availability: InStock

Mystery Detective Worksheets · Grades 2–5 · Space Wars

Grade 2Grade 3Grade 4Grade 5Grades 2-5Answer keys included

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Self-checkingEvery right answer clears a suspect. A wrong answer matches nobody.

No prepPrint and go, or share the link for digital rooms.

Sub-day readyClear instructions and full answer keys.

Inside the case file

3 digit addition with regrouping worksheets for 2nd grade and 3rd grade, five May 4th math case files, Mystery Detective style, set at a training academy in space. May the Fourth math activities, then no prep math centers, early finishers, homework, morning work and sub plans all year, print and go with full answer keys. A missing blade, a tournament, rogue bandits and a base under attack carry the story, every correct sum crosses a suspect off the lineup, and the carrying across the tens and hundreds underneath is real practice that checks itself on each CSI Mini Mystery Detective page.

Early May is when most teachers hand these CSI Mini Mystery Detective math cases out, and it works any other week because the academy story does the holding, not the date. Students add their way through the tournament and the attack on the base, and every sheet is self-marking, with a key for a quick glance.

Trainees have lost a blade, bandits have raided the training center, and an army is heading for the base. Students carry across the tens and hundreds to find each sum, then cross off the matching suspect. Kids who like space adventures will enjoy the stories.

The Cases

The Missing Blade - a lost blade with no name
The Tournament - who will win the tournament
Rogue Bandits - the training center is raided
The Base Is Under Attack - an army closing in
The Master's Lunch - what the master had for lunch

What's Inside

Five space academy cases
3 digit addition with regrouping
Carrying into the tens and the hundreds
Answer keys
A teacher instruction page

What Is a CSI Mini Mystery Detective?

Every case is a page with a story, a set of addition problems and suspect lists. Each suspect has a number. Students cross off the ones that match their sums, and one is left.

When to Use This Resource

Use these after 3 digit addition with regrouping has been taught. 4th graders can use them as review at the end of the year. They suit homework, early finishers, sub days and homeschool.

Grade Levels

For 2nd grade and 3rd grade students who have learned to regroup.

Why Teachers Love These Cases

A space adventure theme
Regrouping in two places
No prep
Students see when a sum doesn't match

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