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Lesson Excerpt:

Launch:

1. Review the term subitize.  Say:

• Subitize means to instantly know an amount without counting.  We can subitize a whole set, or parts within a set.

• When looking at small sets of objects, subitizing is easier and takes less steps than counting each item.  Today, try to use subtizing as we play a game called Battle. 

• Partners place a deck of Conceptual Subitizing Cards face down between them. 

• Each partner takes one card.  On the count of three, partners flip over their cards and compare them.  Whoever has the greater amount, takes both cards.  If both cards are equal, each partner keeps his or her own card.

• Repeat until no cards remain in the deck.

• The partner with more cards wins.