Odd and Even
The test worth teaching is pairing, not the last-digit rule: can everyone hold hands with somebody? If one is left over, it is odd. That explanation survives into much bigger numbers.
Before you print: Print one per child. Counters make the pairing idea obvious if it has not landed yet.
Odd and Even
Can everyone find a partner? Then it is even.
Name
3 · 8 · 11 · 6 · 15 · 20 · 7 · 14 · 9 · 2 · 17 · 12
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