On Thursday 11 March 2010 14:31:14 [email protected] wrote: > On Page 16 of the DRAFT (for Grade 2), under "Length Measurement" is the > statement: "Understand that 1 inch, 1 foot, 1 centimeter, and 1 meter are > conventionally defined lengths used as standard units. "There is no mention > of SI.
The draft is at http://www.corestandards.org/. If the inch and foot are to be kept (which I don't think they should), this should be reworded: "Understand that 1 meter is a base unit and 1 centimeter, 1 inch, and 1 foot are defined in terms of it." > These are all the measurement related statements I have found to data. The > failure to even mention SI is a serious omission in my opinion. I expect > to more formally call attention to this major deficiency. There's also the issue of when to teach fractions. The draft recommends teaching fractions first, then introducing decimals as fractions whose denominator is a power of ten. How should this be taught if metric units and those allowed with SI are the only ones used? (The hour and day are non-decimal multiples, so some use of non-decimal fractions is still needed.) Is there any sense in measuring pencils with paperclips? Pierre -- Don't buy a French car in Holland. It may be a citroen.
