 Working with Cuisenaire Rods In Mathematics (SMILE)  Willis Grace, O. A. Thorp Academy
A lesson for grade 4 designed to teach students about common denominators by teaching the numerical value of each underlined letter of the standard Rod Code; and to develop systematic usage for building new units. From the Arithmetic section of a collection
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 Working with Fractions in Java  Michael Gilleland
Explores various highways and byways of fractions, such as continued
fractions, Egyptian fractions, and Farey sequences, with Java source code.
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 Working with Fractions Using Pattern Blocks  Margo Lynn Mankus
The objective of What's My Number? is to name the size of an object given the size of 1 unit. Materials include pattern blocks cutouts, a pattern block grid, a pattern block Java applet, and links to other pattern block activities elsewhere on the web.
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 The World of Trotter Math  Terry Trotter, Escuela Americana, San Salvador, El Salvador
A page of problems, problem sheets, and investigations, with links to image files of an inclass math newsletter, Trotter Math News. Of particular interest to the author are numbers: happy and dizzy numbers; palindromes; super squares; perfect, amicable,
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 World of Words, Numbers, and Notes  Mike Keith
Mostly original diversions in the areas of mathematics, word play, and music, including a Cadaeic Cadenza, a long pi mnemonic. Also, Ailihphilia (literature and word play) and Scitamatics (mathematical diversions): the recreational study of words, numbers
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 World Wide Mathematics Tutor  ThinkQuest 1996
Fractions, with a bit about decimals: vocabulary, problems and solutions; adding and subtracting fractions and mixed numbers.
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 www.onlineklas.nl  Paul Koning
Flash games for practicing addition (sommenkampioen) or multiplication (tafelkampioen), with timers, high score tables, and memory components (tafels oefenen). Also, drill in identifying fractions, or converting between mixed numbers and improper fractions
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 Zooba Island  Vrilliance Solutions
Free Flash games for children aged 7 to 12 which "inject fun and excitement into learning mathematics." Developed in consultation with Singapore's Ministry of Education Curriculum Planning Department around the Singapore mathematics curriculum, games
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 Zoom Math  I.Q. Joe
The makers of Zoom Algebra, an application with an intuitive visual interface and numerous typing shortcuts. Their apps for TI83 Plus or TI84 Plus graphing calculators let you "type problems in just the way they look in your textbook, and then they
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