5th Grade Math Review CSI Mystery Worksheets
Grades 5–6 · The Missing School Pet
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Inside the case file
Order of operations, adding and subtracting decimals, 2-digit by 2-digit multiplication, rounding decimals and long division worksheets for 5th grade all come together in one no-prep CSI Mystery Detective — a whole grade 5 math review wrapped inside a single detective case. Students work through five clue pages, crossing suspects off the chart one clue at a time, until only the missing school pet is left. Ideal for end of year review, back to school in 6th grade, math centers, morning work, early finishers, sub plans, homework and small group intervention — completely no prep, just print and go.
What's Inside
- Evaluating two-step expressions with the order of operations, brackets included: (7 − 3) x 9, 20 + 5 x 7, 55 ÷ 5 + 29, 7 x 9 − 24
- Adding and subtracting decimals to hundredths with the place values lined up: 85.61 + 3.1, 12.38 + 4.6, 75.13 − 9.3
- Multiplying 2-digit by 2-digit numbers with the standard algorithm: 27 x 82, 73 x 83, 14 x 78
- Rounding decimals to the nearest tenth and to the nearest hundredth: 25.012, 17.926, 22.03, 6.94
- Long division — dividing 3-digit numbers by 2-digit divisors: 336 ÷ 21, 684 ÷ 36, 928 ÷ 32
- Reading evidence off a suspect chart and eliminating suspects clue by clue
- Decoding a coded message, tallying true and false statements, matching answers with drawn lines, shading correct answers to reveal a hidden clue, and tracing a route through a number maze
One full case to crack — The Missing School Pet. Every page prints in full color and in black and white, and a self-checking answer key is included for all five clues and the suspect chart.
What is a CSI Mystery Detective?
It's a print-and-solve math activity — like an escape room without the locks. Students work through math problems to collect evidence, eliminate suspects, and reveal who did it. It combines real skill practice with critical thinking and a detective hook that keeps the whole class engaged.
When to Use This Resource
- End of year math review
- Back to school review at the start of 6th grade
- Math centers and rotations
- Morning work and bell ringers
- Early finishers
- Sub plans and emergency days
- Homework and small group intervention
- Test prep and spiral review
Grade Levels
Designed for 5th grade. Also beneficial for advanced 4th graders ready to stretch into decimals and long division, and for 6th graders who need a confidence-building review of fifth grade number and operations.
Why Teachers Love CSI Mystery Detective packs
- Zero prep — just print and hand out
- Self-checking: a wrong answer garbles the coded message or dead-ends the maze, so students catch their own mistakes
- Covers five different fifth grade standards in one activity instead of five worksheets
- Real computation practice, not a coloring page with sums attached
- The detective hook holds attention on the days nothing else does
- Works as a whole-class lesson, a partner task, or independent work
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