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Mathematics lessons
Explore free interactive mathematics lessons covering arithmetic, algebra, geometry, statistics, and more. Each lesson features hands-on questions and instant feedback to help students build confidence and mastery at their own pace.
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This week in mathematics
The Line on the Floor — How do you split something fairly? (I cut, you choose)
The fairest way to split something between two people is for one of them to divide it and the other to pick first, because then whoever holds the knife has to make both halves equal or lose. Try to cheat your little sister out of half a bedroom, find out why you cannot, discover the strange part where you BOTH end up with more than half, and then build the rule yourself for the things that will not cut in half at all.
The Line on the Floor — How do you split something fairly? (I cut, you choose)
25 questions · 14 min
Three and a Bit — Why is pi 3.14, and what is pi actually measuring?
28 questions · 15 min
Grandpa Never Loses — How to always win the 21 matchstick game (Nim)
22 questions · 15 min
Frostvakten — hur räknar man med negativa tal på tallinjen?
27 questions · 15 min
The Last Slice — How does "I cut, you choose" work, and how do you split something fairly?
13 questions · 12 min
The Short Order — Why does serving the quickest first make everyone wait less?
26 questions · 15 min
Tornet till rymden — vad heter talet när man lägger till en nolla?
12 questions · 9 min
The Number That Wouldn't Share — What is a prime number, and why can't you split it into equal rows?
11 min
Who Moved the Cake? — How do detectives solve a mystery by ruling out what can't be true?
18 questions · 12 min
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Frequently asked
What math topics are available on Viafocus?
Viafocus offers lessons spanning arithmetic, fractions, algebra, geometry, statistics, probability, and calculus fundamentals. New lessons are added regularly by educators worldwide.
Are the math lessons free?
Yes. All interactive math lessons on Viafocus are free to access. Simply browse, pick a lesson, and start learning — no account required.
What grade levels do the math lessons cover?
Our math lessons range from elementary (grades K-5) through high school (grades 9-12) and university level. Each lesson indicates its difficulty and recommended grade range.