This understanding involves seeing a collection as composed of equal groups of two, identifying each pair, and determining the total by counting by twos or combining the groups. It includes recognizing that a group of two represents one pair and that an unpaired object means the collection is not entirely divisible into pairs, providing a foundation for equal groups, arrays, multiplication, and even numbers.
A pair is a group of objects. To find how many objects there are, group the objects into pairs and count by twos.
Example: How many apples are there?
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Start at the left and match two apples together:
Count the pairs: There are pairs.
Count by twos:
There are apples altogether. Since every apple has a partner, the apples can be divided into equal groups of .
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