5th Grade Emergency Sub Plans | Math Mystery Worksheets | No Prep Relief Day Pack

Ten self-checking detective cases built for the day you cannot get in — each page is one case and one 5th grade math topic, and runs 25 to 35 minutes. A substitute hands out a page, students solve, match each answer to a suspect, and cross suspects off until one is left standing. The answer keys are built in, so nothing comes back to be marked. Print once, leave it in the emergency folder, and it also carries spiral review, math centers and early finisher work all year.

Quick Details

Skill: 5th grade review, one math topic per case · Grades: 5–6 · Format: 10 mysteries + full answer keys (printable PDF) · Theme: School detective

The 10 Mysteries

The Book Order Mix Up — The library order was relabelled overnight and no box holds what its label says.

The Snack Cart Slip — Every total was changed and the till will not balance; some clues add and subtract, some ask you to round.

The Paint Can Puzzle — The leftover cans were poured together, and every answer goes in simplest form.

The Locker Code Case — Each new code is hidden inside an expression that has to be worked out in order.

The Field Trip Split — The lists were shared out wrongly, so students divide to find the size of a group.

The Rope Cut Caper — Every rope was cut into equal pieces; the picture shows what was cut and how.

The School Fair Files — Students read each file and decide for themselves whether to multiply or divide.

The New Court Plans — The word above each rectangle says whether to find area or perimeter.

The Leaf Length File — The nature walk records are jumbled, and the line plot answers every clue.

The Stockroom Stack — Count the cubes on the small boxes, multiply the sides on the big ones.

Why Teachers Love It

This is the folder you want already full when you wake up ill. Nothing to photocopy on the way in, nothing a substitute has to teach, and nothing to mark afterwards. Ten different topics fill a whole day without any page feeling like the last, and each is timed to a real lesson block.

Skills Covered

Multi-digit multiplication, long division, decimal addition, subtraction and rounding, adding and subtracting fractions in simplest form, order of operations, dividing to find group size, choosing the operation from a word problem, area and perimeter, line plots, and volume by counting cubes or multiplying edges — plus logical reasoning and deductive elimination as students rule suspects out clue by clue.

What's Included

Printable one-page mystery worksheets, one math topic on each, suspect line-ups, complete answer keys with the villain marked, and student instructions a substitute can read straight off the page — all in one PDF.

Best Used For

Emergency sub plans, planned absences, relief days, spiral review, math centers, morning work, homework, early finishers, indoor recess, and test prep for grades 5–6.

More From This Line

Browse every Math Mystery pack, or fill the folder for the grades below with 4th Grade Sub Plans and 3rd Grade Sub Plans.