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4th grade math and reading mysteries

Every big 4th grade skill, from multi-digit multiplication to equivalent fractions, practiced one suspect at a time. Start with a free warm-up case on the board, then find the pack for this week's lesson.

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Math246Reading62Science48ELA & grammar32Social studies21Phonics1Escape rooms & games84
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Three ways in, depending on what you need this week.

Free warm-up

Case of the Week

A five-minute multiplication case to put on the board. Three clues, six suspects, a new lineup every time you play.

Play it now →
 Grade 4 emergency substitute plans with ten self-checking detective investigations
Most useful

Grade 4 Substitute Plans

Ten self-checking cases covering the whole year. Leave it in the drawer for the day you need it.

See the case file →
 Number patterns and rules 4th grade detective worksheets
Just released

Number Patterns and Rules

Ten cases on generating patterns from a rule (4.OA.C.5), new this month.

See it on TPT ↗
By standard

Every 4th grade skill

Grouped the way the standards are, so you can find the pack for the unit you're teaching right now.

Grade 4 · Math · 4.G

Geometry

  • 4.G.A.1Lines, rays & anglesCase open
  • 4.G.A.2Classify 2D figuresCase open
  • 4.G.A.3Lines of symmetryCase open
See all 2 →
Geometry wars CSI mystery detective triangles angles 3d shapesClassifying Shapes, Triangles & Angles CSI Mystery Worksheets4.G.A.2 · Classify 2D figuresSee the case file →Lines of symmetry complete the figure mystery detective geometry worksheets grade 3-4Lines of Symmetry4.G.A.3 · Lines of symmetrySee the case file →
Beyond math

Reading, science & more

The same detective format: every right answer clears a suspect. Pick a subject below or from the bar at the top.

A 4th grade year

The year planner

One suggestion a month that matches where most 4th grade classes are in the curriculum.

From the blog

Reading for 4th grade teachers

Posts that help with the 4th grade year.

Summer Activities That Stop the Slide: For Summer School, Home and the Last Week: Kiwiland Teaching Blog cover SeasonalOct 30, 2026

Summer Activities That Stop the Slide: For Summer School, Home and the Last Week

For the teacher finishing in June, the summer school teacher and the parent asking what to do in July: small, regular, self-checking work on...

Read the post → End of Year Activities After Testing: A Plan for the Last Four Weeks: Kiwiland Teaching Blog cover SeasonalOct 30, 2026

End of Year Activities After Testing: A Plan for the Last Four Weeks

Fifteen to twenty teaching days after the test, planned as a last pass through the year's skills the class will actually finish. Grades 2–9.

Read the post → Spring Activities for Testing Season: Easter, Earth Day and the Weeks Between: Kiwiland Teaching Blog cover SeasonalOct 30, 2026

Spring Activities for Testing Season: Easter, Earth Day and the Weeks Between

Built for the days around state testing: short, quiet, self-checking and still on standard. Spring, Easter and Earth Day, K–8.

Read the post → St. Patrick's Day Activities, and the March Review Before Testing: Kiwiland Teaching Blog cover SeasonalOct 30, 2026

St. Patrick's Day Activities, and the March Review Before Testing

March is the last clear run before state testing. A St. Patrick's week plan, plus the review days around it, for Grades 1–8.

Read the post → February Activities That Still Teach: Groundhog Day, the 100th Day, Valentine's Day and Presidents' Day: Kiwiland Teaching Blog cover SeasonalOct 30, 2026

February Activities That Still Teach: Groundhog Day, the 100th Day, Valentine's Day and Presidents' Day

Four holidays in the shortest month. A date-by-date plan with self-checking math cases, reading mysteries and digital escape rooms for K–9.

Read the post → Winter math and reading activities for January: Kiwiland Teaching Blog cover with The Big Freeze, 3-digit subtraction across zeros and The Hot Chocolate Case covers in the snow SeasonalOct 30, 2026

Winter Activities for the First Week Back: A January Reset Plan

The first week of January is a review week, not a fresh start. A first-week-back plan for winter math and reading that puts December...

Read the post →
Questions teachers ask

4th grade FAQ

What math do 4th graders learn?

The big four are multi-digit multiplication (up to 4 digits by 1, and 2 digits by 2), long division with up to 4-digit dividends, equivalent fractions and adding fractions with like denominators, and decimals to hundredths. Add factors and multiples, patterns from a rule, measurement conversions, angles and classifying shapes.

How long does one case take?

Most classes finish a single case in 30 to 45 minutes. Each pack has five or ten cases, so one pack covers a unit's practice or a full sub day.

Are they printable or digital?

The mystery packs are printable PDFs with full answer keys, in color and black and white. The digital escape rooms run in a browser and suit a 1:1 device day.

How do students know if an answer is right?

Every correct answer matches one suspect's badge. A wrong answer matches nobody, so students know to go back and check without asking you.