Why Johnnie can't add

Quoting from the Town of Brookline’s newly chosen math textbook for sixth grade:

1 is to 1.67 as 6 is to 10

b/g = b/(b+g)     [this in a situation where b is nonzero]

Two figures that have the same shape are similar.

Figures that have the same size and shape are congruent.

Perimeter: The distance around a two-dimensional shape.

Percent [one word; used as a noun]

The exact value of pi is a decimal number whose digits never end or repeat.

– Impact Mathematics, Glencoe McGraw-Hill, 2009

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