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Nice EdWeek article and video with many links about how teaching of fractions has changed because it is considered integral to math skills.

Do you ask your students to show their work? Should they? This article has an interesting perspective.

I ask them too because I teach alg, these problems become more complicated as the year moves on and they need to write their steps down because there are multiple steps. The ones that have been doing it in their heads for years suddenly cant seem to do that anymore and find themselves in a tricky situation because they don't know how to show their work.