In This Issue
Solutions: 2015 Mathematics Game
Symbolab: My Notebook
The Mathematics of Presidents Washington and Jefferson
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Solutions: 2015 Mathematics Game
http://mathforum.org/yeargames/ yeargameentrys?find=BySolutionFor&form
This past Sunday, we posted solutions to the 2015 Mathematics
Game. Students have sent us their arithmetic from every region
of the US, plus England, Germany, and beyond.
... but we still need answers! Eightythree and 93 have so far
defied expressions made from

the digits in 2015

standard operations

grouping symbols
Several other nearby numbers, toward the bottom of the
pulldown menu of solutions, have garnered only a few answers
apiece. So whether you've blazed a new arithmetic path, or just
taken a commutative detour, come share your basic ops
wizardry here:
http://mathforum.org/yeargames/yeargameentrys?form

PoW taking place: math problemsolving moment of the week

"I plan to use what I know about algebraic equations and make
one accordingly to this problem. Also, I plan to make a dog and
label the parts to understand the lengths.... Looking back,
the part of this problem I found challenging was ..."

 Alexis, highlighted in the PreAlgebra PoW's Latest Solution

http://mathforum.org/pows/solution.htm?publication=4515
Symbolab: My Notebook
http://blog.symbolab.com/2015/02/ mynotebooksymbolabway.html
On Monday, Symbolab rolled out a new feature that lets you
save, annotate, rank, and share the results from its semantic
search engine's stepbystep online solver.
Output now shows up with a "Save" button in the lower right
corner. Clicking it opens a notepad with your problem, which
you can then rank by difficulty and share with friends:
http://symbolab.com/
Symbolab first appeared in these pages the week it launched,
over two years ago — and shortly thereafter, went on to index
the 11,000+ questions and answers from the Forum's own
askanexpert service, Ask Dr. Math. More recently, Symbolab
released its first apps:

Now taking place: math education conversation of the day

"Welcome to how the middle school math teachers have been
feeling about these new tests. We get some 'magic' teacher
grade that is impossible to know how it was determined."

 Cathy, posted to the general discussion group of the
Association of Math Teachers of New York State

http://mathforum.org/kb/message.jspa?messageID=9695841
The Mathematics of Presidents Washington and Jefferson
What did the President know, and when did he know it?
The Library of Congress has the answers, as far as the
mathematics learned by the nation's original Commander in
Chief. It has scanned the school copy books that George
Washington penned with quill and ink as a teenager.
These two volumes handwritten in 1745 by the future first U.S.
President reveal geometrical definitions and problems,
surveying, mensuration, multiplication and division, simple
interest, foreign currency conversion, and other mathematics
from precolonial times:

http://memory.loc.gov/cgibin/ampage?
collId=mgw1&fileName=mgw1a/gwpage002.db

http://memory.loc.gov/cgibin/ampage?
collId=mgw1&fileName=mgw1a/gwpage003.db
The Library's digitization of these volumes has revealed some
omissions, spurring subsequent "detective work" to track down
and correctly situate omitted pages. It has also inspired fresh
primary source research, such as "George Washington's Use of
Trigonometry and Logarithms," published in the 2013 Proceedings
of the Canadian Society for History and Philosophy of
Mathematics (CSHPM):
http://www.academia.edu/5814703/ George_Washingtons_Use_of_Trigonometry_and_Logarithms
For his part, the third President of the United States once
wrote, "When I was young, mathematics was the passion of my
life." This insight appears in a new book about Thomas
Jefferson's metrication efforts that came out last
month — conveniently in time for Presidents' Day, Monday,
16 February.
According to publishers Springer, Thomas Jefferson and his
Decimals 17751810 reveals "how the United States' decision to
adopt a fully decimalized, carefully conceived national
currency ultimately had a profound effect on U.S. school
mathematics curricula."
Subtitled "Neglected Years in the History of U.S. School
Mathematics," the work draws on a large set of arithmetic
textbooks and an even larger set of handwritten cyphering
books. Freely download the front matter and back matter, and
preview sample pages from chapters such as

1776: Dawn of a New Day in School Mathematics in
North America

Thomas Jefferson and an Arithmetic for the People

Decimal Fractions and Curriculum Change in School
Arithmetic in North America in the Eighteenth and
Nineteenth Centuries
http://link.springer.com/9783319025056


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