Free lesson · 8th grade · age 13
A free chess math lesson: Grade 8 Math
chess
This is a free, playable Grade 8 Math lesson for a kid who loves chess: "Rational and Irrational Numbers". It runs in the same interactive player a subscriber's kid uses, with teaching steps, checks they can retry, a mini-game, and a printable worksheet. Add your kid's name and it is woven in, no sign-up.
This lesson starts at the chessboard: club practice split into rounds, the diagonal step a bishop takes across one square, and the strange fact that some numbers, like pi, never settle into a repeating pattern no matter how far you calculate. Your child will sort numbers into rational and irrational, then pin a few tricky ones onto a number line. It's also the first line in the course's big idea: think of every lesson from here as a new line added to your math opening repertoire.
It is lesson 1 of an 8-lesson course on the standard 8th grade sequence, which continues with "Integer Exponents and the Laws of Exponents", "Scientific Notation", "Square Roots, Cube Roots, and the Real Number Line". When you subscribe, your own kid's full course is written around their interests and starts with a quick check of what they already know.
Free to play, no sign-up · your own kid's course comes with Family, $49/mo
Where the full course goes
Lesson 1 is free to play right now. The rest is the standard 8th grade sequence a subscriber's course follows, written around their own kid.
- Rational and Irrational Numbersfree now
- Integer Exponents and the Laws of Exponentsfull course
- Scientific Notationfull course
- Square Roots, Cube Roots, and the Real Number Linefull course
- Checkpoint: Number Sense Mixfull course
- Slope and Proportional Relationshipsfull course
- Linear Equations in One Variablefull course
- Functions: Rules, Tables, Graphs, and Linear Modelsfull course
Middle school is where ratios, negative numbers, and early algebra either click or calcify. These samples rebuild each concept inside an interest the kid picked, so the worked examples feel like theirs instead of a textbook's.
Questions parents ask
Is this a real lesson?
Yes. It is a complete, playable Grade 8 Math lesson built around chess, in the same player a subscriber's kid uses, with a printable worksheet. The later lessons of the course are shown as an outline; a subscriber's course writes all of them around their own kid.
How does the personalization actually work?
You tell Mathbloom your kid's age, the math they need, and a few interests. The course is then generated fresh for them: the sequence of lessons follows real 8th grade standards, while the examples, word problems, diagrams, and humor are built from their interests, with their name woven through. This page's sample shows what that looks like when the interest is chess.
How much practice is there?
Each skill mints fresh problems on demand, so practice never runs out and no two attempts look the same. Right after a lesson introduces a skill, a short loop keeps going until your kid gets three in a row, then the same idea comes back later for review, on a widening schedule, across the whole Grade 8 Math course.
What if my kid is ahead, or behind?
An optional quiz before lesson 1 checks that first, using fresh problems from the same library the lessons draw from, nothing graded. A gap from an earlier grade adds a short Foundations lesson to the front of the course. A skill they already have gets marked done and skipped, recorded honestly instead of repeated. Either way, the first lessons in the Grade 8 Math course are written to what the quiz finds, not a guess.
What does it cost?
Playing this sample is free, no sign-up. A full membership is the Family plan at $49/mo for up to 3 kids, each with their own generated courses, cancel anytime. Tutors and co-ops can run up to 10 learners on Studio at $199/mo.
Is it aligned to grade level?
The sample follows the standard 8th grade scope, and generated courses are built on real grade-level standards with named mastery objectives per lesson. A kid who is ahead or behind simply starts at the level that matches where they are, not their grade label.