Second Grade · Math · week 33

Odd or even numbers

Determine whether a number is odd or even by pairing objects, and connect even numbers to doubles.

A number is even if you can split it into two equal groups with nothing left over, like pairing up shoes. A number is odd if one item is left over after pairing.

Even numbers are also every number you land on when you skip count by 2 starting at 0: 2, 4, 6, 8. Every even number is a doubles fact, like 4 = 2 + 2.

📋 For the teacher
Teach it (10–15 min):
  • Use real pairs -- socks, shoes, hands -- to make "pairing up" a physical, obvious action.
  • Point out the pattern in the ones digit: numbers ending in 0, 2, 4, 6, 8 are always even; numbers ending in 1, 3, 5, 7, 9 are always odd -- a fast check once they trust it.
  • Connect evens to doubles facts they already know: 6 is even because it is 3 + 3.
  • Practice with bigger numbers (like 24 or 37) using just the ones-digit trick once the pairing concept is solid.
Talk about it:
  • How can you tell if a number is odd or even just by pairing objects?
  • What is the fast way to check odd or even using only the last digit?
  • Can two odd numbers add up to an even number? Try 3 + 5.

Mastery looks like: They correctly identify any number as odd or even, using pairing and the last-digit shortcut.

Common stumbles: Forgetting the shortcut only looks at the LAST digit, not the whole number; miscounting during pairing with larger groups.

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