Another reason that printable questions and answers are so useful comes from the reality that you can make as many copies as you need for your class projects. There are some circumstances where it would be easier (and therefore affordable) to simply offer the students one set of answers rather than an entire book or lesson. You might wish to do some group work on an approaching job that needs several long hours of explanation. In this case, it would be more economical to simply have a couple of group sheets printed rather than printing out numerous hundred pages of handouts.
Using group work in the classroom can be an excellent method to make class interaction more memorable and meaningful. Often it’s easier to ask questions to a larger group rather than whittle your answers down to a handful.
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