Volume 10, Number 22

 ```May 30 2005 Vol. 10, No. 22 THE MATH FORUM @ DREXEL INTERNET NEWS MathMem | Fractions and Ratios | Math-A-Thon MATHMEM http://www.atlanticwinds.com/mathmem/ Jim Guinness, Wachusett Regional High School in Massachusetts, has compiled a list of mnemonics and similar memory aids that help students remember math conventions, algorithms, definitions, techniques, and formulas. "Most high school math teachers are familiar with using PEMDAS, FOIL, and SOH-CAH-TOA in this way. More exotic techniques, like singing the quadratic formula, can also be helpful if they suit your teaching style ..." Additional contributions for remembering math concepts K-12 welcome by e-mail or telephone. \|/ TEACHER2TEACHER FAQ: TRICKS FOR LEARNING MATH http://mathforum.org/t2t/faq/faq.tricks.html Answers to a frequently asked question: What are some math tricks and mnemonic devices I can use with my students? -|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|- FRACTIONS AND RATIOS http://whyslopes.com/etc/fractions/ Alan Selby has added a new section called Fractions and Ratios to his site "Appetizers and Lessons for Mathematics and Reason." This new area "offers a thought-based development of fractions, what they are, how to compare, add, multiply and divide them." Selby organized his pages under these topics: 1. What is a Fraction 2. Multiplication I: Unit Fraction of Unit Fraction 3. Multiplication II: Unit Fraction of a Simple Fraction 4. Multiplication III: Simple Fraction of a Simple Fraction 5. Equivalent Fractions 6. Mixed Numbers 7. Comparison of Fractions 8. Addition & Subtraction I: Case of Like Denominators 9. Addition & Subtraction II: Case of Unlike Denominators 10. Addition & Subtraction III: Efficiency Matters - Use of LCD 11. Multiplication IV: Efficient Ways to Multiply Fractions 12. Division of Fractions 13. Two Term Ratios 14. Implied Ratios 15. Multiple Ratios The earlier site area on solving linear equations visually reinforces Selby's concept of fractions and arithmetic operations on them, while geometrically introducing algebra. http://whyslopes.com/etc/solvingLinearEquations/ -|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|- MATH-A-THON http://www.mathathon.org/ Students participating in a Math-A-Thon obtain sponsors and earn prizes by completing "funbooks" of math problems such as hidden messages, puzzles, and pure arithmetic operations. Proceeds from this supplemental math program build an endowment fund to ensure St. Jude Children's Research Hospital's continued efforts in research and treatment of childhood catastrophic diseases such as cancer. Open to participation for children in grades K-9 across the United States, Math-A-Thon began in the late 1970s. The website also offers online games such as Number Blaster and puzzles such as Math Squares, E-cards to send, and screensavers to download. -|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|- CHECK OUT OUR WEB SITE: The Math Forum @ Drexel http://mathforum.org/ Ask Dr. Math http://mathforum.org/dr.math/ Problems of the Week http://mathforum.org/pow/ Mathematics Library http://mathforum.org/library/ Math Tools http://mathforum.org/mathtools/ Teacher2Teacher http://mathforum.org/t2t/ Discussion Groups http://mathforum.org/kb/ Join the Math Forum http://mathforum.org/join.forum.html Send comments to the Math Forum Internet Newsletter editors Donations http://deptapp.drexel.edu/ia/GOL/giftsonline1_MF.asp Ask Dr. Math Books http://mathforum.org/pubs/dr.mathbooks.html _o \o_ __| \ / |__ o _ o/ \o/ __|- __/ \__/o \o | o/ o/__/ /\ /| | \ \ / \ / \ /o\ / \ / \ / | / \ / \ ```