Browse math whodunits
Every case is printable and verified to have one unique solution.
Grade 1
The Case of the Roaring Dino
Grade 1Place valueAdditionSubtractionSkip counting
The Mystery at Adventure Camp
Grade 1AdditionSubtractionSkip countingPlace value
The Great Space Station Mystery
Grade 1AdditionSubtractionMultiplicationSkip counting
The Glitter Valley Mystery
Grade 1AdditionSubtractionSkip countingPlace value
The Magic Star Mystery
Grade 1AdditionSubtractionSkip countingPlace value
The Missing Championship Ball
Grade 1AdditionSubtractionSkip countingPlace value
The Case of the Missing Golden Pineapple
Grade 1AdditionSubtractionSkip countingPlace value
Grade 2
The Mystery of Golden Lake
Grade 2Place valueSubtractionAdditionSkip counting
The Mystery of the Gym Saboteur
Grade 2AdditionSubtractionSkip countingWord problems
The Moon Base Mystery
Grade 2MultiplicationPlace valueAdditionSubtraction
The Moon Base Mystery
Grade 2MultiplicationPlace valueAdditionSubtraction
The Golden Trophy Mystery
Grade 2Place valueAdditionSubtractionSkip counting
The Eras Tour Mystery
Grade 2Place valueAdditionSubtractionSkip counting
The Great Tennis Court Mystery
Grade 2Place valueAdditionSubtractionSkip counting
The Great Recital Mischief
Grade 2AdditionSubtractionPlace valueSkip counting
Grade 3
The Mystery of the Rainbow Reef Trophy
Grade 3Place valueSkip countingFractions of a numberRounding
The Mystery of the Missing Golden Trophy
Grade 3MultiplicationWord problemsPlace valueRounding
The Mystery of the Missing Golden Trophy
Grade 3MultiplicationPlace valueWord problemsRounding
Mystery of the Cloud Island Map
Grade 3RoundingAdditionSubtractionMultiplication
The Cyber Reef Mystery
Grade 3MultiplicationRoundingAdditionSubtraction
The Search for Praneesh
Grade 3Place valueMultiplicationRoundingWord problems
The Great Pearl Reef Heist
Grade 3MultiplicationRoundingAdditionSubtraction
The Moonbase Sabotage
Grade 3RoundingMultiplicationWord problemsPlace value
The Missing Championship Trophy
Grade 3RoundingFractions of a numberMultiplicationPlace value
The Golden Cup Mystery
Grade 3RoundingAdditionSubtractionMultiplication
Mystery at Starlight Stadium
Grade 3RoundingAdditionSubtractionMultiplication
The Mystery of the Missing Championship Trophy
Grade 3RoundingAdditionSubtractionMultiplication
Mystery at the Temple of the Golden Monkey
Grade 3MultiplicationAdditionRoundingSubtraction
The Great Dino Dig Mystery
Grade 3MultiplicationAdditionSubtractionPlace value
The Tornado Alley Mystery
Grade 3AdditionPlace valueRoundingSubtraction
The Mystery of the Missing Anemometer
Grade 3AdditionRoundingSubtractionMultiplication
The Great Detective Guild Heist
Grade 3AdditionPlace valueMultiplicationSubtraction
The Case of the Missing Diamond
Grade 3Place valueAdditionSubtractionMultiplication
The Case of the Missing Golden Badge
Grade 3AdditionPlace valueSubtractionMultiplication
The Case of the Missing Ledger
Grade 3MultiplicationPlace valueAdditionRounding
The Great Stadium Sabotage
Grade 3Place valueAdditionSubtractionMultiplication
The Case of the Missing Championship Trophy
Grade 3AdditionSubtractionMultiplicationRounding
The Whispering Woods Treehouse Case
Grade 3MultiplicationRoundingAdditionSubtraction
The Big League Mystery
Grade 3AdditionSubtractionMultiplicationRounding
Grade 4
The Mystery of the Glitch Bot
Grade 4MultiplicationRoundingAdditionSubtraction
The Great Fossil Mystery
Grade 4AdditionRoundingSubtractionMultiplication
The Mystery of the Rogue Dragon
Grade 4RoundingAdditionSubtractionMultiplication
The Mystery of the Missing Golden Fish
Grade 4RoundingAdditionSubtractionMultiplication
The Mystery of the Missing Golden Horseshoe
Grade 4RoundingAdditionSubtractionMultiplication
Mystery at Sunken Temple
Grade 4MultiplicationRoundingAdditionSubtraction
Mystery of the Cloud Castle Sky Pirate
Grade 4MultiplicationRoundingAdditionSubtraction
The Lost Compass Mystery
Grade 4MultiplicationMulti-step word problemsRoundingAddition
The Cosmic Craft League Mystery
Grade 4MultiplicationPlace valueWord problemsRounding
The Mystery of the Harbor Haul
Grade 4RoundingAdditionSubtractionMultiplication
The Fizzy Falls Flavor Heist
Grade 4RoundingMulti-step word problemsWord problemsMultiplication
The Mystery of the Barnacle Bay Heist
Grade 4RoundingAdditionSubtractionMultiplication
The Mystery of the Missing Treasure Map
Grade 4Place valueAdditionSubtractionRounding
The Mystery of the Temple Idol
Grade 4RoundingAdditionSubtractionMultiplication
The Great Schoolhouse Scramble
Grade 4RoundingAdditionSubtractionMultiplication
The Mystery of Sunken Island
Grade 4AdditionRoundingSubtractionMultiplication
The Lost Temple Treasure Mystery
Grade 4Fractions of a numberRoundingPlace valueSkip counting
The Mystery of Starlight Station
Grade 4RoundingAdditionSubtractionMultiplication
The Mystery of the Golden Bloodworm
Grade 4MultiplicationSkip countingRoundingAddition
The Mystery of the Missing Championship Trophy
Grade 4Place valueAdditionSubtractionMultiplication
The Jungle Temple Mystery
Grade 4Place valueAdditionSubtractionMultiplication
The Mystery of the Golden Fossil
Grade 4Place valueAdditionSubtractionMultiplication
The Golden Cup Mystery
Grade 4RoundingAdditionSubtractionMultiplication
The Cloud Kingdom Heist
Grade 4AdditionSubtractionMultiplicationRounding
Grade 5
The Lunar Outpost Mystery
Grade 5RoundingWord problemsPlace valueMulti-step word problems
Mystery at Cretacia Park
Grade 5AdditionSubtractionMultiplicationFractions of a number
The Mystery of the Autumn Manor Library
Grade 5Fractions of a numberWord problemsOrder of operationsMultiplication
The Lunar Base Mystery
Grade 5MultiplicationWord problemsFractions of a numberOrder of operations
The Obsidian Court Mystery
Grade 5AdditionMultiplicationRoundingSkip counting
The Mystery of the Missing Championship Hoops
Grade 5Place valueMultiplicationRoundingFractions of a number
The Hardwood Arena Mystery
Grade 5MultiplicationRoundingPlace valueBar models
The Sky Academy Airship Heist
Grade 5MultiplicationRoundingPlace valueBar models
The Championship Trophy Heist
Grade 5Fractions of a numberOrder of operationsMultiplicationRounding
The Case of the Miscalculated Mastermind
Grade 5Fractions of a numberOrder of operationsMultiplicationRounding
The Lunar Base Heist
Grade 5Fractions of a numberOrder of operationsMultiplicationRounding
The Strikers League Trophy Mystery
Grade 5Fractions of a numberOrder of operationsMultiplicationRounding
The Mystery of the Missing Championship Trophy
Grade 5Fractions of a numberOrder of operationsMultiplicationRounding
The Great Whisker Harbor Heist
Grade 5Place valueMultiplicationSkip countingAddition
The Mystery of the Misty Jungle Temple
Grade 5MultiplicationRoundingPlace valueFractions of a number
The Halloween Archery Mystery
Grade 5Fractions of a numberOrder of operationsMultiplicationRounding
The Shiz University Grimmerie Heist
Grade 5RoundingMultiplicationFractions of a numberOrder of operations
The Case of the Grand Slam Phantom
Grade 5Place valueAdditionSubtractionMultiplication
The Mystery of the Missing Championship Trophy
Grade 5Fractions of a numberOrder of operationsMultiplicationRounding
The Case of the Championship Trophy Hijack
Grade 5MultiplicationFractions of a numberOrder of operationsRounding
The Phantom Bovine of Barnstar Nine
Grade 5Place valueAdditionSubtractionMultiplication
The Cup Final Caper
Grade 5MultiplicationFractions of a numberOrder of operationsRounding
The World Cup Trophy Heist
Grade 5MultiplicationFractions of a numberOrder of operationsRounding
The Golden Trophy Heist
Grade 5MultiplicationFractions of a numberOrder of operationsRounding
The Golden Boot Heist
Grade 5MultiplicationFractions of a numberOrder of operationsRounding
The Golden Boot Heist
Grade 5MultiplicationFractions of a numberOrder of operationsRounding
Grade 6
The Cloud Runner Heist
Grade 6MultiplicationSkip countingPlace valuePercentages
The Orbital Catnip Heist
Grade 6AdditionMultiplicationWord problemsMulti-step word problems
The Mystery of Nithusha's Emerald Bracelet
Grade 6RoundingPercentagesExponentsOrder of operations
Mystery of the Missing Crystal Horn
Grade 6Place valuePercentagesExponentsOrder of operations
The Quantum Lab Mystery
Grade 6MultiplicationMulti-step word problemsPercentagesExponents
The Quantum Lab Heist
Grade 6PercentagesExponentsOrder of operationsMultiplication
The Golden Bone Mystery
Grade 6Place valueAdditionSubtractionMultiplication
The Great Unicorn Cup Mystery
Grade 6Place valueAdditionSubtractionMultiplication
The Whiskertown Championship Mystery
Grade 6MultiplicationFractions of a numberPercentagesExponents
Grade 7
The Intergalactic Cup Sabotage
Grade 7Fractions of a numberBar modelsWord problemsMulti-step word problems
The Case of the Mer-Cat Hoops Swindler
Grade 7Fractions of a numberMulti-step word problemsMultiplicationIntegers
The Quantum Laboratory Heist
Grade 7IntegersMulti-step word problemsPercentagesOrder of operations
The Lunar Base Sabotage
Grade 7Place valueIntegersPercentagesOrder of operations
The Mystery of the Sunken Sun Idol
Grade 7Fractions of a numberWord problemsIntegersPercentages
The Case of the Mid-Air Stadium Sabotage
Grade 7IntegersPercentagesOrder of operationsExponents
The Case of the Candy Prix Saboteur
Grade 7IntegersPercentagesOrder of operationsExponents
The Great Protein Powder Caper
Grade 7IntegersPercentagesOrder of operationsExponents
The Mystery of Siren Cove
Grade 7Place valueAdditionSubtractionMultiplication
The Mystery of the Jurassic Corsair
Grade 7Place valueSubtractionAdditionFractions of a number
The Cosmic Crystal Caper
Grade 7Place valueAdditionMultiplicationSkip counting
The Mystery of the Great Archive
Grade 7Fractions of a numberMultiplicationMulti-step word problemsIntegers
The Grand Slam Gold Mystery
Grade 7IntegersPercentagesOrder of operationsExponents
The Case of the Missing Golden Glove
Grade 7IntegersPercentagesOrder of operationsExponents
The Diamond Dome Heist
Grade 7IntegersWord problemsMulti-step word problemsPercentages
Grade 8
Grade 9
Grade 10
Mystery of the Cloud Peak Pirate
Grade 10Pythagorean theoremSquare rootsExponentsOrder of operations
The Case of the Golden Stethoscope
Grade 10MultiplicationSubtractionAdditionPlace value
The Great Stethoscope Caper
Grade 10MultiplicationWord problemsFractions of a numberAddition
The Great St. Pete Lab Mystery
Grade 10AdditionSubtractionMultiplicationRounding