Interpreting Line Graphs

Inside the case file

Interpreting line graphs activities, reading graphs worksheets, and data analysis practice for 3rd grade, 4th grade, and 5th grade are all included in this printable Mini Mystery Detective pack of math worksheets. Ten one-page detective cases turn reading a line graph into solving a crime, and every page is completely no prep - just print and go.

Students read a scaled line graph, fill in the missing numbers on the data table beside it, answer twenty clues, and cross suspects off the line-up until one villain is left standing. Because every answer has to match a suspect's ID badge, the whole page is self-checking - a wrong answer matches nobody and sends the student straight back to the graph.

What's Inside

• Reading a value straight off a scaled line graph, including points that sit between the gridlines
• Working out how much a total rose or fell from one day to the next, and finding the biggest rise and the biggest fall across the whole graph
• Comparing two points: how many more, how many fewer
• Adding points together for two-day, three-day and whole-week totals
• Two-step problems: how many were not on Monday, how many were not on Tuesday or Friday
• Finding the highest point, the lowest point, and the difference between them
• Completing a data table from the graph, so students move between a table and a line graph of the same data
• Axes that build across the pack, from counts in the tens up to counts in the hundreds

Ten cases to solve: The Cup Stack Caper, The Food Drive Fix, The Fish Tank Fiasco, The Plant Pot Puzzle, The Car Park Case, The Hat Stand Heist, The Toy Box Tangle, The Jam Jar Jumble, The Wood Shed Wobble and The Pen Order Puzzle. Red-ink answer keys are included for every case, with the completed data table filled in.

What is a Mini Mystery Detective?

A Mystery Detective is a print-and-solve detective activity - an escape room without the locks, the boxes or the setup. Each page holds one case, one graph and a line-up of suspects wearing numbered ID badges. Every problem a student solves eliminates one suspect, and the last suspect standing is the villain.

Students know straight away whether they are right, because a correct answer always matches somebody on the page. That makes the whole activity self-marking and keeps them working without needing you at their shoulder.

When to Use This Resource

• Math centers and rotations
• Morning work and bell ringers
• Early finishers
• Emergency sub plans
• Homework and independent practice
• Test prep and end-of-unit review
• Small group and intervention work

Grade Levels

Designed for 3rd, 4th and 5th graders. The pack is deliberately built as a ramp: the early cases use small counts on a simple axis, and the later cases move into the hundreds with numerals printed only every second or third gridline. That means one pack stretches from students who need an introduction to reading a line graph through to those ready for two-step problems, and it is also beneficial for struggling 6th graders or advanced 2nd graders.

Why Teachers Love Mystery Detectives

• Zero prep - just print, no cutting, no cards, no setup
• Completely self-checking, so students correct themselves instead of queuing at your desk
• The detective hook gets reluctant students to finish a full page of graph work
• Twenty questions a page, so it fills a lesson rather than five minutes
• Every case is a separate page, so you can use them in any order or spread them across a unit
• Built-in differentiation across the ten pages without handing out visibly different sheets

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