Another way to
write the problem in the Challenge, where x
weight of the little fish,
y is the weight
of the medium fish,
is the weight of the big fish,
+ y = 5
+ z = 7
+ z = 6
As a young woman, Mary
Fairfax Somerville (17801872) discovered
while reading a ladies fashion magazine. In its
pages, she saw a question with strange looking lines
mixed with letters, chiefly Xs and Ys
(Perl, 1978). She continued to study mathematics until
she was 92.
Council of Teachers of Mathematics (NCTM) recommends
that algebraic thinking start in pre-kindergarten
using concrete, pictorial, verbal, and symbolic representations.
formulas require algebra.
are found in popular reading materials. For example, the
formula for Body Mass Index
(BMI) is found in The Old Farmers Almanac (2000).
(See Challenge 21)