ViafocusViafocusViafocus
EN
English
SV
Svenska
ViafocusViafocusViafocus
EN
English
SV
Svenska

About This Lesson

Who Moved the Cake? — How do detectives solve a mystery by ruling out what can't be true? is a free, interactive beginner-level mathematics lesson covering math. Designed for grades 3, 4, 5, this 12-minute lesson includes 18 interactive questions with immediate feedback to help learners master key concepts.

What You'll Learn

  1. Understand the key ideas in Mathematics
  2. Practise with 18 interactive questions and instant feedback
  3. Follow a clear lesson, step by step

Lesson Details

Type
Lesson
Subject
math
Category
Mathematics
Difficulty
Beginner
Grade Level
3, 4, 5
Duration
12 minutes
Questions
18
Language
English
Cost
Free

Frequently Asked Questions

Are Viafocus lessons free?

Yes — every lesson in the library is free to play in the browser, with no account required. A free account lets you save lessons and see results.

ViafocusViafocusViafocus
EN
EnglishEnglish
SV
SwedishSvenska
ViafocusViafocusViafocus
FocuspilotStudioPricingFor SchoolsExplore
SecurityHow we protect student data
Digital examsExams in locked mode on Chromebook
BlogLatest updates and tips
ContactReach out to us
EN
EnglishEnglish
SV
SwedishSvenska
Home/Explore/Mathematics/Who Moved the Cake? — How do detectives solve a mystery by ruling out what can't be true?
LessonMathematicsBeginner

Who Moved the Cake? — How do detectives solve a mystery by ruling out what can't be true?

Detectives and doctors don't guess who did it — they cross off everyone who couldn't have, one clue at a time, until a single answer is left. Sami's birthday cake has vanished from the kitchen table and you're sure it was your sweet-toothed cousin — but rule out every suspect a clue clears and the only one still standing is the one nobody suspected. Learn process of elimination by cracking the case yourself, then solve a second one, and meet the real method behind it: eliminate the impossible, and whatever remains, however improbable, must be the truth.

12 min18 questionsGrades 3, 4, 5
VCreated byViafocusOfficial Viafocus lesson
Start lesson
W
Official lesson

Questions preview

18 questions

first 4 shown
  1. 1Who do you think did it?Interactive
  2. 2Cross off everyone the clues clearInteractive
  3. 3How did you find who moved the cake?

More mathematics lessons

View all mathematics →
M
Beginner
MathematicsGrades 3, 4, 5, 6

Midsommar i snön — varför finns skottår?

14 questions · 7 min

Browse allMathematicsScienceLanguage ArtsHistoryGeographyTechnologyArtPhysical Education
Start lesson

Can I run a lesson live with my class?

Yes. Start a live session from any lesson — students join with a code on their own devices, and their answers land on your dashboard in real time.

Who creates the lessons?

Teachers in the community and the Viafocus studio team. Lessons built by the Viafocus studio carry a blue verified mark next to the byline.

Can I use a lesson someone else made?

Yes. Any published lesson can be played, shared with a class, or copied into your own library so you can adapt it before teaching it.

Created By

Viafocus

Lessons handcrafted by the Viafocus team.

Multiple choice
  • 4The reading-cup caseInteractive
  • Lesson details

    Lesson
    Lesson
    Subject
    Mathematics
    Difficulty
    Beginner
    Grade level
    Grades 3, 4, 5
    Length
    About 12 min
    Language
    English · Svenska

    What to expect

    1. 1Understand the key ideas in Mathematics
    2. 2Practise with 18 interactive questions and instant feedback
    3. 3Follow a clear lesson, step by step

    In class

    Start on the projector or share a code — students answer on their own devices and results land on your dashboard.

    P
    Beginner
    MathematicsGrades 3, 4, 5

    Pappersdockorna — vad är symmetri?

    11 questions · 7 min

    A
    Intermediate
    MathematicsGrades 4, 5, 6, 7

    Arbetsbladet vid spelbordet: hur löser man uppgifter om logik, tärningar och kombinationer?

    28 questions · 25 min

    A
    Intermediate
    MathematicsGrades 5, 6, 7

    Arbetsbladet om regler, vågar och kartor: hur hittar man regeln i ett mönster, löser en ekvation och läser koordinater?

    31 questions · 25 min