THERE are some technical difficulties in the handling of small amounts of protein fractions precipitated with neutral salts, such as sodium sulphate, in the usual way, because of the comparatively ...
Many children never master fractions. When asked whether 12/13 + 7/8 was closest to 1, 2, 19, or 21, only 24% of a nationally representative sample of more than 20,000 US 8th graders answered ...
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