Adding and subtracting mixed numbers – Grade 4

[Bill McCallum]

This is still causing a bit of confusion. I just uploaded a version of the progression with the new language here. It makes clear that adding and subtracting fractions with one denominator dividing the other is not a requirement in Grade 4 except in the case of denominators 10 and 100. But it also makes clear that this is still a possibility in the case of simple additions such as $\frac13 + \frac16$ where the idea is not to present a general rule but to reason directly with simple equivalences and the definition of addition using visual representations such as fraction strips. So, you couldn’t put this on an assessment in Grade 4 but you could put it in the curriculum.

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