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The Lumenary

Each worksheet prints cleanly on A4 or Letter. Answer keys are on a separate page.

The Lumenary · K–2

Collections

Name: ______________________

Date: ______________________

You will learn to

  • Sort objects into collections using a rule
  • Say whether something belongs to a collection
  • Tell when two collections are the same
  • Recognise the empty collection
  • Count a collection, and see that the order of counting does not matter
  1. 1.

    Here is a collection: 🍎 🍌 🍐. Which one is a member of this collection?

    • A.🍌 the banana
    • B.🍋 the lemon
    • C.🍓 the strawberry
  2. 2.

    How many members does this collection have? 🍊 🥕 🍋 🍎 🍐

  3. 3.

    Kenji's box has 🍎 🍌 🍐. Lucía's box has 🍐 🍎 🍌. Are they the same collection?

    • A.Yes, they are the same collection
    • B.No, they are different collections
  4. 4.

    The box for blue fruit is empty. How many members does the empty collection have?

  5. 5.

    Gideon's game: the collection is 🍌 🍋 🥒. Is this statement true or false? "Every member of this collection is yellow."

    • A.True
    • B.False
  6. 6.

    For older children: from apple, banana, strawberry and lemon, write the collection of red things. Use words separated by commas, like {kiwi, plum}.

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Answer key — Collections

  1. 1.

    The members are exactly 🍎, 🍌 and 🍐. Only the banana is one of them, so the banana is the member.

  2. 2.

    Touching each one once: orange (1), carrot (2), lemon (3), apple (4), pear (5). There are 5 members.

  3. 3.

    Both boxes have exactly the members apple, banana and pear. Two collections with the same members are the same collection, whatever the order.

  4. 4.

    There is nothing inside, so the empty collection has 0 members. It is still a collection!

  5. 5.

    The cucumber 🥒 is green, so not every member is yellow. The statement is false. One example that breaks the rule is called a counterexample.

  6. 6.

    The red things are the apple and the strawberry, so the collection is {apple,strawberry}\{\text{apple}, \text{strawberry}\}. Writing {strawberry,apple}\{\text{strawberry}, \text{apple}\} is the same collection.