2-Digit Addition & Subtraction
Mystery Detective Worksheets · Grades 1–3 · Halloween
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Inside the case file
Halloween 2 digit addition and subtraction worksheets for 1st grade and 2nd grade: five October math case files, Mystery Detective style, both skills on the same page. Print and go with full answer keys: no prep math activities for morning work, math centers, early finishers, homework and sub plans. Halloween math for 1st grade and 2nd grade, with 2 digit addition and subtraction on the same page and a witch to catch, so both skills get practiced in October. It fits Halloween math centers, morning work and early finishers, with a CSI Mini Mystery Detective story on every page.
October is the month a young class will do almost anything for a good story, and a teacher turned into a skunk keeps them adding and subtracting for a week. Students rule out a suspect with every answer on the way to the witch, and one case fits a morning work slot. Each CSI Mini Mystery Detective math sheet is self-marking.
The Cases
- Skunk Surprise - the teacher has been turned into a skunk
- Trick or Treat Teacher - a student surprised the teacher
- Mouse Mischief - a friend is now a mouse
- Under The Costume - who is inside that costume
- Costume Competition - a winner, and no name read out
What's Inside
- Five Halloween cases, each a page of 2 digit addition and subtraction
- Sixteen questions per case, mixing both operations
- Clue lists beside the questions, so one answer removes one clue
- A black and white copy of all five cases for everyday printing
- An answer key for every case
- Print and go: no cutting, no laminating, nothing to prepare
What Is a CSI Mini Mystery Detective?
A CSI Mini Mystery Detective is one printed page with a crime at the top and short clue lists beside the questions. Every clue carries a number, the questions produce those numbers, and a correct answer crosses that clue off. Whatever is left at the end is the solution. Nothing is cut, laminated or charged, so the arithmetic does the whole job and a wrong answer fits nothing.
When to Use This Resource
The two weeks before Halloween are the obvious spot, and the day itself in particular, when a costume parade has already taken the morning and the class will not settle to anything ordinary. These also work as a straight two digit review at any point in the fall, because the mixed operations page is the same either way. Everything is printed on the sheet, so it goes into the sub folder as it is.
Use it for morning work, math centers, early finishers, homework, class parties, sub plans and homeschool lessons, with a whole class, a small group or one student.
Grade Levels
Written for 1st grade and 2nd grade. First graders use these once two digit work has started, and second graders use them as a mixed operations review in the fall.
Why Teachers Love These Cases
- A young class stays with it, which is the whole trick in October
- Nothing to prepare beyond pressing print
- Five cases covers the two weeks before Halloween
- Works with a whole class, a small group, partners or one student
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