4th Grade Review | Math Mystery Worksheets | Back to School | Angles Fractions Area

A whole year of 4th grade math, one topic per detective case — students solve each problem, write the answer in the box beside it, match it to a suspect, and cross suspects off until one is left standing. This no-prep, printable, self-checking Math Mystery is built for the first weeks back, and works just as well for spiral review, math centers, morning work, homework, early finishers, substitute/relief days and test prep. Every page is a different standard, so the pack doubles as a beginning-of-year diagnostic.

Quick Details

Skill: Whole-year 4th grade review, one topic per case · Grades: 4–5 · Format: 10 mysteries + full answer keys (printable PDF) · Theme: Back to school detective

The 10 Mysteries

The Stockroom Switch — Every order has been multiplied by the wrong number and nothing on the shelves adds up.

The Leftover Ledger — The kitchen ledger says every tray was shared evenly, but the remainders say otherwise.

The Vanishing Digits — Digits have gone missing from the school records, leaving nonsense behind.

The Ticket Booth Fix — Someone rewrote the show-night totals and the numbers no longer match.

The Folded Flag Case — Half of every flag in the art room has been cut away, so students fold each design back out along its line of symmetry.

The Matching Slices — Every cake has been recut into smaller slices, and equivalent fractions reveal how much was taken.

The Shaded Squares — Part of every mosaic panel has been shaded, and students write each shaded amount as a decimal.

The Tilted Telescope — Every telescope has swung to a new angle, so students read each one off the protractor.

The Fenced Field File — The farm measurements were swapped in the file, and students find the area or the perimeter.

The Ribbon Riddle — Each X on the line plot is one ribbon; students lay them end to end and total the length.

Why Teachers Love It

Zero prep — print and teach. The built-in answer keys make every case self-checking, so students get instant feedback and stay motivated. Because each page targets a different standard, the pack tells you in one sitting which topics the class has actually kept over the break — and the detective hook pulls in reluctant and struggling learners.

Skills Covered

Multi-digit multiplication, division with remainders, place value and multi-digit numbers, multi-step addition and subtraction, lines of symmetry, equivalent fractions, decimals from shaded models, measuring angles with a protractor, area and perimeter, and line plots — 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 — all in one PDF.

Best Used For

Back to school review, beginning-of-year diagnostics, spiral review, math centers, morning work, homework, early finishers, substitute/relief days, and test prep for grades 4–5.

More From This Line

Browse every Math Mystery pack, or pick up the grade either side with 3rd Grade Review and 5th Grade Review.