3-Digit Addition with Regrouping

Name: 3-Digit Addition with Regrouping | Mystery Detective Worksheets | Grades 2–5 | New Year Theme
Brand: Kiwiland Education
SKU: 5131465
Price: 4.0 USD
Availability: InStock

Mystery Detective Worksheets · Grades 2–5 · New Year Theme

2nd grade math3rd grade mathGrade 2Grade 3Grade 4Grade 5Answer keys included

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

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Inside the case file

New Years 3 digit addition with regrouping worksheets for 2nd grade, 3rd grade and 4th grade: five January math activities, each a Mystery Detective case with sixteen column sums. Print and go with full answer keys and a black and white set, no prep, for math centers, morning work, early finishers, homework and sub plans in the first week of the new year. Somebody set the party popper off early, somebody sang the wrong words to Auld Lang Syne and the countdown is one number short, and every correct total takes a suspect off the list while a missed carry matches nobody, which is how one CSI Mini Mystery Detective download pulls three digit carrying out of the holiday rust.

Three digit column addition is the skill worth bringing straight back after a holiday, and the first week back is exactly when this set shines. A case gives the practice a reason to exist, and the marking is student-led, so students find their own carrying slips as they go. It is the bigger sister of the 2 digit New Year pack, with the same party, harder math and the same Mystery Detective rules.

The Cases

Party Popper - who set it off early
New Year Gift - the gift nobody owns up to
Auld Lang Syne - working out who sang what
New Year Countdown - a count that does not add up
New Year Party - the last case of the night

What's Inside

Five color case pages, sixteen addition problems on each
The same five cases again in black and white
Answer keys for all five cases
A color in page for early finishers
A teacher instruction page, print and go with nothing to prepare
Three digit addition with regrouping throughout

What Is a CSI Mini Mystery Detective?

One printed page holding one crime and the clue list that solves it. Each clue carries a number, the sixteen sums on the page produce those numbers, and a correct total knocks a clue out. Work to the last question and a single suspect is left standing. Get a column wrong and nothing matches, which sends a student back over their working before you ever see it.

When to Use This Resource

Reach for this in the first days back in January, once three digit addition has been taught and simply needs keeping warm. It works as homework over the break, as a January center, and as a set to leave for a substitute. Use it for math centers, morning work, early finishers, homework, sub plans and homeschool lessons, with a whole class, a small group or one student.

Grade Levels

Written for 2nd grade, 3rd grade and 4th grade. Fifth graders who still need column addition firmed up get plenty out of it, and confident second graders manage it with a little support.

Why Teachers Love These Cases

A wrong total matches no clue, so students catch their own slips
Color and black and white are both in the download
A color in page for whoever finishes first
Five cases covers the whole first week back

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