Prime Slap Concentration
A matching game · Two decks · Ages 6 and up
The four colors.
Every card uses these four colors. Each color means one number. Always. Start here.
Setup — same for all levels
Shuffle both decks into one pile of 104 cards. Lay all cards face down in a grid. For younger or first-time players start with cards 1 to 20. Add the rest once the game feels comfortable.
What counts as a match
Two cards showing the exact same number.
The 6 card matches with another 6. Numbers only.
How to play
On your turn flip two cards face up.
Same number — take both and go again. No match — turn them back over. Most pairs wins.
What a match looks like
Match!
Both show 6. Take the pair.
Not a match at Level 1
6 and 12 are different numbers. Turn them back over.
Parent tip: Do not explain the colors yet. Just play. Let your child notice things on their own.
Before you start
The 12 card shows two blue characters and one red. That is because 12 = 2x2x3. The colors are the number broken apart. Once your child sees this they cannot unsee it.
What counts as a match
Two cards that share the same prime factor colors.
Cards do not have to show the same number. They just have to share all the same colors.
The rule that makes it stick
Before taking a pair say it out loud.
Name the shared colors. If you cannot explain it the cards go back face down.
The families
Blue family: 4 and 8
4 = 2x2 · 8 = 2x2x2 · All blue. Valid match.
Your child says: "Both are made from twos."
Blue-Red family: 6 and 12
6 = 2x3 · 12 = 2x2x3 · Both share blue and red. Valid match.
Your child says: "Both have blue and red in them."
Red family: 9
9 = 3x3 · All red. Matches other all-red cards.
Parent tip: When cards do not match ask: What do you notice about these two cards?
What counts as a match
Two cards both prime or both composite — and your child can explain why.
For composite cards: name the prime factor colors. For prime cards: read the diamond markers.
A glimpse of Level 3
11 — Extended Prime
Yellow + one blue diamond. 6(2) minus 1 = 11.
47 — Extended Prime
Yellow + three blue diamonds. 6(8) minus 1 = 47.
30 — Composite
Blue + red + yellow. 2 x 3 x 5 = 30.
The thing to know: Level 2 mastery is the goal. Level 3 is the reward.
Where this goes
A child who has played through all three levels has built the perceptual foundation for prime factorization, fraction simplification, and algebraic thinking — not by being taught, but by playing.
Prime Slap at intellivance.com · Two-deck pack · Ages 6 and up
Questions? dariel@intellivance.com