The physical deck ยท for math club & classrooms

A deck of cards. No rules in the box.

Separate from the study site, MathKong is also a small hand-drawn deck of number & operator cards. Kids shuffle, deal, and write their own rules. Mental math happens on the way โ€” without anyone calling it practice.

52 hand-drawn cards
2โ€“6 players ยท ages 8+
No screen needed
~ how to play ~

No rules come in the box.

The cards arrive blank on purpose. Players agree on a goal, deal a hand, and figure out how to reach the goal using the numbers and operators they were dealt. Every round is a tiny math puzzle of their own design.

+
01

Pick a target

Agree on a number to hit โ€” 24, the age of whoever's turn it is, or whatever you feel like today.

โˆ’
02

Deal the hand

Everyone gets a handful of number & operator cards. The mix is random; the challenge is using what you've got.

ร—
03

Invent the rule

First to reach the target wins? Closest wins? No repeats? Kids argue, agree, and play. The rule is part of the game.

รท
04

Write it down

The notebook is where the proofs live. Show your work, compare strategies, revisit a trick that worked last week.

~ invent your own game ~

The rules are the homework.

Most math apps hand kids a problem and wait for the right answer. The card game flips it: the kids make the problem. They argue about fairness, fix edge cases, and rewrite the rules until the game feels right.

  • 1.
    Shuffle the deck

    Numbers 0โ€“9 plus +, โˆ’, ร—, รท. Pull a target card from the top.

  • 2.
    Agree on a win

    Reach the target exactly? Get closest? Use every operator? Kids decide.

  • 3.
    Play a few rounds

    Then tweak the rule. "Losing card" penalties. Multi-round tournaments. Secret targets.

  • 4.
    Write what worked

    The notebook keeps the rules someone's family invented. Bring them back next week.

~ looking for the study site? ~

The booklets live over there.

If you came here looking for the Grade 7 / 8 / 9 math lessons and practice quizzes, those are on the main study site.