1 More 1 Less 10 More 10 Less
Mystery Detective Worksheets · Grades 1–2 · Back to School
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Inside the case file
1 more 1 less and 10 more 10 less activities, place value worksheets, and mental math practice for 1st grade and 2nd grade are all included in this Mini Mystery Detective pack with a school theme. There are fifteen detective cases. Use them for math centers, morning work, early finishers or homework. It's no prep, with an answer key for every case.
What's Inside
- Finding 1 more and 1 less than a two-digit number: 45 and 46, 76 and 77, 98 and 99
- Finding 10 more and 10 less than a two-digit number: 23 and 33, 62 and 72, 89 and 99
- Mixed practice on one page - 1 more, 1 less, 10 more and 10 less around the same number at once
- Reading and completing a number chart to build mental math fluency without counting on
- Using answers to eliminate suspects, which makes every page self-checking
- Full answer keys for every case
Fifteen school mysteries to crack: the missing class pet, the stolen markers, the silent lunch bell, the vanished trophy, the empty book bin, the lost-and-found box, the cookie caper, the deflated ball, the muddy footprints, the missing fire key, the swapped name tags, the missing microphone, the stolen poster, the locked closet, and the missing album.
What is a Mini Mystery Detective?
A no-prep detective activity where students solve math problems to cross off suspects and unmask the culprit. Every answer matches one suspect's number. Correct answers eliminate them one by one until a single suspect is left.
When to Use This Resource
- Warm-ups
- Sub days
- Small-group intervention
- Spiral review and test prep
- Whole-class place value practice
Grade Levels
Designed for 1st and 2nd graders. It also gives 3rd graders more place value practice, and works for advanced kindergarteners.
Why Teachers Love Mystery Detectives
- Nothing to prepare
- Self-checking
- Mysteries set around a school
- Mental math practice with some logical thinking
- Fifteen separate one-page cases
Want more cases like these?
Follow Kiwiland Education to discover more Mystery Detectives, place value activities, and detective-themed stories for elementary classrooms.
