Problem 1:
This is a cryptarithm: letters have replaced some letters in an arithmetic "sum" and you need to find the digit represented by each letter. Given that


find the digits represented by each letter.



Mathcelebration   Mathcelebration

1. General Expository Material

  1. Cut The Knot!

    From the home page: This site is for teachers, parents and students who seek engaging mathematics. Many of the topics are accompanied by Java illustrations. There are more than 900 Java applets. The applets can be licensed by teachers for inclusion in their own pages.

  2. Plus

    From the home page: Plus magazine opens a door to the world of maths, with all its beauty and applications, by providing articles from the top mathematicians and science writers on topics as diverse as art, medicine, cosmology and sport. You can read the latest mathematical news on the site every week, subscribe to our fortnightly email newsletter, read our online magazine published four times a year, and browse our archive containing all past issues and news items.

  3. Nrich

    From the home page: The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice. …On this website you will find thousands of our free mathematics enrichment materials (problems, articles and games) for teachers and learners from ages 5 to 19 years. All the resources are designed to develop subject knowledge, problem-solving and mathematical thinking skills.

  4. Math Forum

    From the home page: Math Forum Is the leading online resource for improving math learning, teaching, and communication since 1992. …We are teachers, mathematicians, researchers, students, and parents using the power of the Web to learn math and improve math education. We offer a wealth of problems and puzzles; online mentoring; research; team problem solving; collaborations; and professional development. Students have fun and learn a lot. Educators share ideas and acquire new skills.

2. History of Mathematics

  1. St Andrews MacTutor History of Mathematics
  2. David Joyce’s History of Mathematics
  3. Euclid’s “Elements”
  4. The Mathematical Problems of David Hilbert
  5. Math Forum Internet Resource Collection
  6. Convergence
  7. Resources on Women Mathematicians
  8. British Society for History of Mathematics

3. Teaching of Mathematics: Pedagogical Issues

  1. Home page of Prof. Hung-Hsi Wu
  2. National Council of Teachers of Mathematics
  3. E Resources in Mathematics

4. Software for “Doing” Mathematics

4.1. Dynamic Geometry Packages.

  1. GeoGebra
  2. The Geometer’s Sketchpad
  3. Cabri II Plus
  4. Cabri 3D
  5. C.a.R. (“Compass and Ruler”)
  6. Cinderella — Interactive Geometry Software

4.2. Computer Algebra Systems.

  1. Derive 6
  2. Maxima, A Computer Algebra System
  3. Mathematica 7
  4. Maple 12
  5. GAP

4.3. Other Mathematics Software.

  1. Autograph 3.2
  2. Graphmatica
  3. FractInt 20.0
  4. MSW Logo
  5. 3D-XplorMath
These lists will be cumulatively added to, presently. We will also be adding links to sites featuring:
  • Geometry
  • Number Theory
  • Algebra
  • Combinatorics
Readers are invited to share their favourite math websites. Please write to us!
Mathcelebration   Mathcelebration

Do you have a question to ask, that is related to school level mathematics or mathematics teaching? If so, please feel free to type it in the box below.

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I will use it to initiate a discussion among the readers, or endeavour answer it directly.

Here are some suggestions for typing in technical matter:

  • Use simple and straightforward language.
  • Be brief.
  • If the question refers to a figure, describe the figure in a simple and clear way.
  • Write mathematical text in ordinary language:
    • x^2 for x2;
    • e^x for ex;
    • sin^2 (t) for sin 2t;
    • log 2 for log 2;
    • pi for π;
    • theta for θ;
    • alpha for α;
    • beta for β;
    • gamma for γ;
    • delta for δ.

    And so on.

The archive below contains a list of questions taken up earlier, and the responses they got.