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RE: CC Alg 1 Rounding Rules
Posted:
Aug 22, 2013 9:29 AM



This Common Core (and PARCC frameworks) standard seems to be the appropriate one. A Story of Functions says that this standard is addressed in both Module 1 and Module 5. However, Module 1 did not include any direct instruction on it.
NQ.3 Choose a level of accuracy appropriate to limitations on measurement when reporting quantities.
Rounding is tricky. There are different rules for different operations. In Module 2 standard deviation is routinely rounded to the hundredths place without consistent direction in the problem (sometimes rounding instruction were given, sometimes not) or explanation. There was an A2T problem last year(?) that students got wrong b/c they rounded the standard deviation to the units place and appeals were denied on the basis that they should have known better.
We definitely need more clarification on this topic.
Meg Clemens
Canton Central School
NBCT 2002  2022



