This is one of the student worksheets that comes with the textbook I'm using. I can understand having differently sized boxes for paper clips. They seem small enough that they can fit into a variety of packaging. But pens and envelopes?! Isn't there a missing context here: pens and envelopes have a fixed size! Would the pens (#2) in the 4x5x3 box fix in the other boxes? How long are they? Likewise, what size are the envelopes (#3)? Are they a standard size? It seems that any link to reality must be omitted for a student to be successful with questions.
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