 100s and 1000s  Horsham Primary School; WimmeraNet
An Internet project from Horsham, Victoria, Australia. Activities about 100s and 1000s, a Wimmera Global Classroom project coordinated by Ian Clough at Horsham 298 to recognize the beginning and end of a century and a millennium. Contributions are added
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 11 Plus Exams  Nick George
Interactive math tests, with detailed explanations.
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 Animated Educational Software  FLIX Productions
Shareware for PC platforms, including programs designed to teach children about money, timetelling, shapes, math (counting, addition, subtraction for preK through 1st grade), and multiplication and division (for 1st3rd graders).
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 Animated Math Glossary  Math Advantage  Harcourt Brace School Publishers
A K8 glossary of common mathematical terms, categorized by grade. Each entry has an example, most of which are animated. An "other" section at the end of the alphabet gives tables of metric and customary measurements, time, formulas, and symbols. You
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 Assignment Calculator  The University of Minnesota
Enter the date you will begin an assignment and its due date, then select a subject area such as mathematics, and the Assignment Calculator will outline steps to take to complete the work on time.
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 Astronomy Calculator  R.T. Back
The Astronomy Calculator provides general information about the phases of the moon and planets, and annual meteor showers. You supply the date, time of observation, and the number of hours east and west from directly overhead.
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 The Aztec Calendar: Math, Geometry, and Design  Charles William Johnson
A site that explores the relation between the mathematics of ancient reckoning systems, expressed in historically significant numbers (cited in the historical record), and designs within the geometry of ancient artwork. The complexity of design within
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 The Aztec Calendar  René Voorburg
Historical information and illustrations of the two more or less independent systems comprising the Aztec calendar, one having 365 days and based on the agricultural or solar year, the other with 260 days. A Calculator allows you to enter a date in the
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 Birthday Surprises  Ivars Peterson (MathTrek)
It's rather unlikely that you and I share the same birthday (month and date). The more people you pull into the group, however, the more likely it is that at least two people will have matching dates. Ignoring the minor technicality of leap years, it's
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 Burning 1Hour Fuses in 45 Minutes (Math Chat)  Frank Morgan, MAA Online
You have two onehour fuses: lighting one end of a fuse will cause it to burn down to the other end in exactly one hour's time. You know nothing else about the fuses; in particular you don't know how long any segment of a fuse will burn, only that an
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 CalculateHours  Molly Parker
This online time card calculator calculates hours worked. Add the widget to your site by copying the code provided. Training sessions teach how to use Excel to add up hours, average hours, and convert decimal hours or military time into conventional hours.
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 Calculators OnLine Center: Part II  Mathematics  Martindale's Reference Desk
Over 7,420 calculators for: Unit Conversion (Time, Distance, Length, Speed, Weight, etc.); Abacus; Basic Math; Complex Mathematics; Complex Math Education; Complex Math Calculators by Specialty: Algebra and Linear Algebra; Algorithms; Calculus; Central
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 Calendar Math  Kees Couprie
Algorithms for converting dates from one calendar to another and for calculating the dates of (religious) events. Also an Excel AddIn available for download.
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 Calendar Quirks  Ivars Peterson (MathTrek)
Calendars represent our efforts to create frameworks that allow us to reckon time over extended periods. We normally count the day  the time it takes Earth to rotate once on its axis  as the smallest unit of calendrical time. The measurement of fractions
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 Calendars  L. E. Doggett
An introduction to calendars: what they are; astronomical bases of calendars; calendar reform and accuracy; historical eras and chronology; the Gregorian Calendar  ecclesiastical rules, history; the Hebrew Calendar  rules, Determining Tishri 1, Reasons
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 The Calendar Zone  Janice McLean
A collection of links about calendars, organized by topic: celestial, cultural, geographic, historic, etc. Includes an extensive list of calendar software for a 3000 Years Calendar (look through Julian, Gregorian, Hebrew and Islamic calendars to see conformity
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 Calendopaedia  The Encyclopaedia of Calendars  Michael Astbury
A Comparison of Calendars, including Julian, Gregorian, Mayan, and Hebrew, details about these calendars and their history, and brief notes on different ways we measure time.
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 Calendrical Calculations  Nachum Dershowitz and Edward M. Reingold
A book about the algorithms used to calculate different calendars (Gregorian, Julian, Mayan, Hebrew, Persian, and more.) The preface, table of contents, index, and a sample chapter are available in PDF and PostScript formats. Other book resources include
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 Candy Byte Software  Nily Aharon
Mathamagica, for ages 711, provides rigorous math skill practice within an animated, interactive setting with colourful graphics and characters. Concepts include addition, subtraction, multiplication, division, sequences, greater than/less than, telling
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 Chronological Age Calculator  AGS Publishing
Click the "Age Calculator" button, then enter two calendar dates to compute elapsed years, months, and days. Available for download.
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 Circle Graph  What Percent?  NASA Lewis Learning Technologies Project
This circle graph shows how Jimmy spent his time during the last 24 hours. What percent of time did he spend watching television? A detailed answer is provided. From NASA's 9th Grade Math Proficiency Test.
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 Count Us In!  Australian Broadcasting Corporation
Fifteen colorful counting and math games designed to help young children understand basic number concepts. Each game has directions and some have levels of difficulty to choose from. Number concepts include: Comparing and Classifying; Patterning; Counting;
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 Course Project Suggestions (Geometry and the Imagination)  Conway, Doyle, Gilman, Thurston; The Geometry Center
An list of suggestions for projects in geometry, topology, symmetry, making geometric solids, calendars, spherical and hyperbolic trigonometry, puzzles, models, etc. Projects were to be exhibited at the Geometry Fair at the end of the course.
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 Cracking the Myth of Ball Control  Ivars Peterson (MathLand)
Ball control has become common practice in a number of sports. In basketball, for example, coaches often urge their teams to slow down a game at certain times or to control its tempo. In professional football, "time of possession" has become a statistic
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 Daylight Savings Time  Jim Loy
A short explanation of Daylight Savings Time in the United States.
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 Day Of The Week Of Any Date  Jim Loy
An explanation of how to figure the day of the week for any date, with some detailed shortcuts and some tables you might memorize.
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 Dear Marilyn, About Leap Years (Math Chat)  Frank Morgan, MAA Online
Your explanation [in Parade Magazine] of September 13, 1998 that we may need to skip a leap year EVERY FEW THOUSAND YEARS because the tropical year (about 365.2422 days) is a bit shorter than the average calendar year (365.2425 days) neglects CHANGES
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 Derek's Daily Math  Derek Orr
"Every Number Has a Story to Tell." This blog by an undergraduate at the University of Pittsburgh details number theoretic properties for every day of the calendar year. Orr, a physics and math major, also maintains a list of "Interesting Propositions/Theorems
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 Distance, Rate, and Time  Math Forum, Ask Dr. Math FAQ
Distance = Rate x Time: A discussion and two problems.
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 Elapsed Time (SMILE)  Bernice Joyce Henry, Edward H. White School
A lesson designed to teach students to calculate elapsed time, given beginning and ending time; and to state the time using A.M. and/or P.M. From the "Miscellaneous" section of a collection of almost 200 single concept lessons by the Science and Mathematics
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 Eye Opener Series  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
A collection of Java applets that illustrate and thus help to solve or prove various math problems: Euclid's Proof of the Pythagorean Theorem; Construction problem; Disappearing Lines puzzle; Sam Loyd's fifteen; Sliders puzzle; Lucky 7 puzzle; Happy 8
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 Famdays
A famday is a day on which the combined ages of family members add up to a whole number of years  in a sense, a family birthday, a reason for a celebration that contributes to strengthening family ties. Students can compute famdays for their families
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 Fibonacci's Chinese Calendar  Ivars Peterson (MathTrek)
In a book completed in 1202, mathematician Leonardo of Pisa (Fibonacci) posed the problem: How many pairs of rabbits will be produced in a year, beginning with a single pair, if every month each pair bears a new pair that becomes productive from the second
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 The Four Seasons  KRT  Kentucky Connect
Pages on Understanding Equinox and Solstice, and The Changing Seasons.
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 Franklin Institute Science Museum  Philadelphia, Pennsylvania
The online entry point for the Philadelphia science museum, featuring indepth multimedia virtual exhibits and explorations, resources for teachers, and guides to the reallife museum and its programs. The website features a large selection of educational
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 Future of Leap Seconds  Steve Allen
Allen, an astronomer, discusses leap years, leap seconds  and how to avoid their use when redefining Coordinated Universal Time (UTC): three pictures that show the situation; elapsed time (JavaScript that shows POSIX's inability to provide an interface
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 Geometrí con Cabri Géomètre II  José Antonio Mora
Materiales interactivos para el aprendizaje de la Geometría con la utilización del programa CabriGéomètre II. Geometría de los Mecanismos; Coordenadas en Cabri II. Cabri sketches that simulate the working procedure
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 A Glitch in Time  Ivars Peterson (MathLand)
On June 30, time stood still for one second. Clocks stopped and an additional second was added to the day. This adjustment was needed to bring the official time into agreement with Earth's eversoslowly decreasing rotation rate. It was the 21st leap
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 Global Sun Temperature Project  Stevens Institute of Technology, CIESE
An Internetbased multidisciplinary project (10 March  13 June 2003) that allows students to collaborate with other students and with experts online in determining how their locations affect their average daily temperature and hours of sunlight. Students
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 The Grey Labyrinth  Kevin Lin
A collection of mindbenders in math and logic. When a solution to one puzzle is posted, another solutionless puzzle is added. With an archive of past puzzles, links to other puzzlerelated sites, and a bibliography of works that inspired this site.
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 The Hand Squeeze: A Data Collection and Analysis Class Experiment  Cynthia Lanius
An experiment: measuring the amount of time that it takes for a hand squeeze to pass around a circle. Record, graph, and analyze the data, and make predictions about the time it would take for more people/greater distances.
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 Heavenly Mathematics: Highlights of Cultural Astronomy  Helmer Aslaksen
An interdisciplinary course that begins by discussing the relative motion of the Sun, Earth, and Moon, and follows with other fundamental concepts of astronomy.
Course content includes astronomy, astrology, calendars (Gregorian, Chinese, Islamic, Indian),
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 Helmer Aslaksen
A mathematics professor at the National University of Singapore. Research involves abstract algebra, including the trigonometry of symmetric spaces, and calculations for the Chinese, Islamic, and Indian calculators. Papers about these topics may be
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 Hexadecimal Headquarters  Intuitor
A comparison of base ten and base sixteen (hexadecimal), discussing why we should switch to hexadecimal. The site includes a hex clock, and explanations of both base ten and hexadecimal.
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 A history of time: 20th century time
 MacTutor Math History Archives
Linked essay on the dramatic changes in ideas about time in the 20th century.
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 A history of time: Classical time
 MacTutor Math History Archives
Linked essay on the central role time has played in mathematics from its very beginnings.
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 Homework for Kids  hwforkids.com
More than 275 pages of math worksheets and word problems. Most pages are dynamic and will provide a different set of exercises when reloaded. Print out worksheets at several levels for learning numbers, addition and subtraction, multiplication and division,
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 Hope's Mathematics Books for Teachers  Hope Martin
A collection of math activity books to order for elementary, middle school, and high school students, written by Hope Martin: What Year am I?: A Math Warmup a Day, Multiple Intelligences in the Mathematics Classroom, 730 Daily Math Warmups, Integrating
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 Houston Area RealTime Traffic Report  Susan Boone
Students calculate the time needed to travel a certain distance given the rate of speed with data collected using "realtime" traffic maps of the greater Houston area. Over a period of one week, one month, and one school year, traffic patterns are studied
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 Identical Calendars for 2000 (Math Chat)  Frank Morgan, MAA Online
For programming into the VCR on January 1st for correct day and date, what years in the 1900s have the same calendar as the year 2000? An identical calendar must, like 2000, be a leap year starting on a Saturday. Leap years occur every four years, and
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