5. Ask Dr. Math
Website:
http://mathforum.org/dr.math/
Ask Dr. Math is a question
and answer service for math
students and their teachers.
A searchable archive is
available by level and topic,
as well as summaries of
Frequently Asked Questions
13. National Library of Virtual
Manipulatives
Website:
http://nlvm.usu.edu/en/nav/vlibrary.html
Library of uniquely
interactive, web-based
virtual manipulatives and
concept tutorials
19. Lobster Diver
Addresses number and operations
standards established by the National
Council of Teachers of Mathematics
Understand numbers, ways of
representing numbers, and number
systems.
Understand and represent commonly
used fractions.
Understand fractions as part of unit
wholes and as locations on number lines.
Compare and order fractions, and find
their approximate locations on the
number line.