In order to understand how many blocks arranged in a lengthwise fashion will correspond to another group of blocks laid widthwise, a child needs an understanding of

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Equivalency is the understanding that two things are equal in value or amount, even if they appear different. In this case, the child needs to understand that the number of blocks arranged in a lengthwise fashion is equal to the number of blocks laid widthwise, even though the two arrangements look different.

In Order to Understand How Many Blocks Arranged in a Lengthwise