4th Grade Emergency Sub Plans | Math Mystery Worksheets | No Prep Review Activities

Ten self-checking detective cases you can leave on the desk and walk away from — each page is one case and one 4th grade math topic, so a substitute hands out a page, students solve, match each answer to a suspect, and cross suspects off until one is left standing. No prep, no explaining, no marking: the answer keys are built in. Print the whole pack once, keep it in the emergency folder, and it covers a day at no notice — or works as spiral review, math centers, morning work and early finisher work the rest of the year.

Quick Details

Skill: 4th grade review, one math topic per case · Grades: 4–5 · Format: 10 mysteries + full answer keys (printable PDF) · Theme: School detective

The 10 Mysteries

The Packing Slip Job — Every box in the supply room is packed to the wrong count and no slip matches what is inside.

The Uneven Share — The kitchen book says the trays were shared evenly, but every tray has a different number left on it.

The Recut Pies — Every pie has been recut into smaller slices and nobody can tell how much is left.

The Smudged Register — The office register is smudged top to bottom and the school numbers cannot be read.

The Tiled Floor Case — Part of every tile panel has been shaded and the plan no longer matches the floor.

The Field Trip Files — The files were rewritten overnight and not one total adds up.

The Cut-Out Caper — Half of every paper cut-out is missing, so students fold each design back out.

The Skipped Numbers — Numbers have been skipped along the locker row and the caretaker's count is out.

The Late Bell Case — Every clock stopped at once and the bell rang late; each clock shows the time it stopped.

The Playground Plans — The plans were swapped and every measurement is in the wrong place.

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 — students check themselves as they eliminate suspects. Ten different topics means it fills a whole day without a single page feeling like the last one, and it keeps working long after the sub has gone.

Skills Covered

Multi-digit multiplication, division with remainders, fractions, place value, decimals, multi-step problems, symmetry, number patterns, elapsed time, and area and perimeter — 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 4–5.

More From This Line

Browse every Math Mystery pack, or fill the folder for the grades either side with 3rd Grade Sub Plans and 5th Grade Sub Plans.