Odd or Even
Free odd-or-even game for kindergarten and 1st grade: tap odd or even for each number. Fast, friendly number-sense practice. No sign-up.
K–Grade 1 · Free · No sign-up
How to play & why it works
A number appears; tap ODD or EVEN. That is the whole game — two big tiles, instant feedback, and numbers that creep upward as the run goes on. Simple enough for a five-year-old to play unassisted.
Odd and even is the first piece of number theory children ever meet, and it is sneakily important: it trains attention to the ones digit (a core place-value habit) and gives kids their first experience of a rule that works for every number, no matter how big.
The insight to reach for: only the last digit matters. 47 is odd because 7 is odd; 130 is even because 0 is even. Pairs are the concrete anchor — even numbers split into pairs with nobody left over.
The free MathIt app surrounds this with a full kindergarten track — counting, comparing, ten-frames, patterns — all object-based and playable before a child can read.
The whole rule lives in the last digit. 0, 2, 4, 6 and 8 make a number even no matter how long it is — 3,847,192 is even, and you only had to look at one character. Children who try to reason about the whole number get slower as the numbers grow; children who learn to check the ones digit never do.
Underneath the digit rule is the real idea: even means it can be split into two equal groups with nothing left over. Pairing objects up makes that concrete, and it is worth doing once with counters before relying on the shortcut.
Skills you'll practice
Keep practicing
Frequently asked questions
How do you tell if a number is odd or even?
Look only at the last digit. If it ends in 0, 2, 4, 6 or 8 it is even; 1, 3, 5, 7 or 9 and it is odd. The rest of the number does not matter.
Is zero odd or even?
Zero is even. It divides into two equal groups with nothing left over, and it sits between two odd numbers in the counting sequence — both tests agree.
What age do children learn odd and even?
Kindergarten and first grade, usually alongside counting and pairing activities. It is one of the earliest number-property ideas children meet.
Get the full game
Adaptive difficulty, daily streaks, and live 2–5 player math battles — free on iOS and Android.