 A Million/Billion Seconds  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about millions and billions of seconds, such as "What is a million seconds in weeks, days, hours, minutes, and seconds?" and "How can I work out the number of seconds since 1980, taking leap years into account?"
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 Mind Over Math  Mind Over Math, Inc.
Local to Orangeville and Waterloo, Mind Over Math is a tutoring centre that offers help for students in the Ontario Curriculum. The company has specialized programs tailored to the different courses, and can make available workbooks for purchase. The
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 Mirror, Mirror (MatheMUSEments!)  Ivars Peterson (Math Muse for Kids)
If you stand between two mirrors that are parallel to each other, one in front of you and one behind, you see countless images of yourself. Light rays bounce back and forth between the mirrors to create that endlessly repeated pattern.
What happens when
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 Miss Maggie's Earth Adventures  Kathy Smith
An animated site for students that offers free curriculum material for teachers. Math activities are based on the concepts in the animation and help students see the relevance of math in daily lives and in making important decisions. Stories suggest
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 Money Math  Education 4 Kids, Inc.
Three types of games at two levels of complexity: making change, spending money, and "Piggy Bank Breakin."
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 Money Matters (SMILE)  Barbette Flennoy, Joseph Stockton School
A lesson designed to introduce students to different countries' money and the United States monetary value of a penny, a nickel, a dime, and a quarter. From the Practical and Applied Math section of a collection of almost 200 single concept lessons by
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 Money Sense (SMILE)  Marie Bijou Wong, Joseph Warren Elementary School
A lesson designed to teach students to identify and know the value of quarters, dimes, nickels, and pennies; to use a variety of coins to show the value of a dollar; and to count the exact amount of purchase. From the Practical and Applied Math section
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 Money Skills (Early Learning Series)  Marblesoft Software
Four activities for the Mac that teach counting money and making change in American and Canadian money.
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 Moogie on the Net!  Joseph Emanuel, Emanuel Software
Commercial drill and diagnostic software where the numbers always change. Not meant to instruct students or to present them with new material, but rather, to help them learn the process of solving problems. Software aligned to national and numerous state
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 More Fibbery  Gregory K. Pincus
"Fibs./ Terse./ Defined./ As your tools,/ Twenty syllables;/ How you use them is up to you." The author explains this form of poetry and its two most important rules: the syllable count of 1/1/2/3/5/8  the first six digits from the Fibonacci sequence
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 Morphing Art (MatheMUSEments!)  Ivars Peterson (Math Muse for Kids)
When you're riding along on your bike or in a car, you sometimes see the word "ONLY" painted on the roadway just before an intersection. The white letters look normal from where you're sitting. But if you were standing beside the "ONLY" instead of riding
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 mrbaskerville84  Chris Baskerville
Recitations of times tables, set to R&B music and sung with autotuning.
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 Multiplication and Areas (SMILE)  Albert Michael, Robert Fulton Elementary School
A lesson for grades 35 designed to teach twodigit multiplication using math facts; how to find areas of rectangles and squares using stamps and Lego pieces; and how to fill an order of items of equal and different prices and quantities. From the "Miscellaneous"
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 Multiplication (SMILE)  Virginia Muhammad, John Hope Community Academy
An elementarylevel lesson designed to teach students to perform basic computations using multiplication, and to use the operation to evaluate expressions involving whole numbers and decimals. From the Arithmetic section of a collection of almost 200
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 Multiplication Table (Dave's Math Tables)  Dave Manura
The multiplication table, a trick for remembering 9's, and links to tips for learning to multiply and doing arithmetic in your head.
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 Multiplication Tips  Calculation Tips & Tricks, The Math Forum
Tips contributed by students for multiplying by 5, 9, and 11.
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 Murderous Maths  Kjartan Poskitt et al.
Contents, descriptions of characters, updates, and "extra bits" for the books Murderous Maths; The Essential Arithmetricks; Desperate Measures; Do You Feel Lucky?; Vicious Circles and other Savage Shapes; The Phantom X; The Fiendish Angletron; The GCSE
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 Murfy Maths  Iguana Entertainment Limited
Click contiguous hexagons, each filled with a digit or a basic operation, to form expressions that result in a specified target number, with bonus points for speed, accuracy, and including special tiles. Demo this Flash game for free; purchase a freestanding
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 Musical Multiples  MusicWorks 4 Learning
A multisensory approach to the times tables using manipulatives and music. Purchase the Musical Multiples CD, which contains 11 songs for the multiples of 212.
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 Music through the Curriculum  Phil Tulga
Developers of math programs such as "Math and Music," which teaches students how to "hear" math (what does a fraction sound like? how about a shape?); and "Math, Science and Sound," an assembly and family night program that connects thunder, volcanoes,
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 My Dear Aunt Sally  Ron Larson
The game "My Dear Aunt Sally" reinforces number sense, from single operations on whole numbers to multiple operations on rationals. Features hints; audio in English or Spanish; hundreds of difficulty levels; animations of Aunt Sally and her animal friends;
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 Napier's Rods (SMILE)  Irene Santos, Alexander Graham School
A lesson for the elementary grades designed to reinforce multiplication facts; examine Napier's Rods in relation to multiplication; and enhance students' ability to understand place value. From the Recreational and Creative Math section of a collection
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 NASA Explorer Schools  National Aeronautics and Space Administration (NASA)
Each spring, NASA establishes a threeyear partnership with 50 new NASA Explorer School teams, consisting of teachers and education administrators from diverse communities across the country. NASA invites the selected teams to work with education specialists
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 The NASA SCIence Files  NASA Langley Research Center
A series of free instructional programs consisting of a broadcast, print, and online elements. Emphasizing standardsbased instruction and problembased learning, the NASA Sci Files motivate students in grades 35 to become critical thinkers and problem
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 Nature's Numbers (MatheMUSEments!)  Ivars Peterson (Math Muse for Kids)
The most common number of petals on a flower is five. Five also shows up in arrangements of seeds. Pineapples have eight rows of scales, seen as roughly diamondshaped markings, sloping in one direction and 13 sloping in the other. Pine cones show the
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 NewMedia Project: Integers  MathStar, Los Angeles County Office of Education
The NewMedia Project area of MathStar offers resources in mathematics for middle school teachers and students. The Integers unit is comprised of three lessons: Introducing Integers, Adding/Multiplying Integers, and Subtracting Integers. Each of the three
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 Nice Guys Finish First (Sometimes) (MatheMUSEments!)  Ivars Peterson (Math Muse for Kids)
There's trouble in the schoolyard. A kid has accused you and your pals of doing something you shouldn't have. You have to decide whether to stick with the gang or go your own way. You're not completely sure you can trust your friends, so you face a tough
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 NICSI Mountain  Kay Emerson, Evan McKenna Foundation
NICSI (Now I Can See It) Mountain is a 3D math manipulative that allows students to visualize and kinesthetically explore abstract concepts such as rates of change, fractions, ratios, commmon multiples, factoring, graphing, and linear equations. It consists
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 Nikoli  Nikoli Co., Ltd.
From the Japanese magazine publishers that popularized sudoku puzzles: the nikoli.com site releases three or more problems every day  more than 100 new problems a month. Step through tutorials and solve Flash puzzles of Slitherlink, Nurikabe, Heyawake,
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 Noon Day Project  CIESE Collaborative Projects
Over 2,000 years ago, Eratosthenes made a remarkably accurate measurement of the earth's circumference. This project is a recreation of that experiment and invites the collaboration of students living at different latitudes to take measurements of shadows,
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 Number Addition Race (SMILE)  Janice Schaults, Randolph Magnet School
A lesson for elementary students designed to teach addition: students solve addition word problems relevant to their experience and participate in an addition game that uses a phenomenological approach. From the Arithmetic section of a collection of almost
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 Number Loving  Laura ReesHughes and Sharon Derbyshire
Freely downloadable PDFs, Microsoft Word documents, and PowerPoint presentations, organized by UK key stages, strands, and topics. The Number Loving blog offers new approaches for teaching maths and tips for classroom makeovers. Posts, which date back
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 NumberZ  Allen & Allen Semiotics
An upgraded version of Flash98, a PC flash card program that encourages fast memorization of basic math facts. Download the files for a free Demo that unlocks to become the full program once registered.
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 Numeracy Hour Activities  Ambleside Primary School on the Web
Games designed by or with children, and interactive teaching programs to download. Games and activities include Amblegraph (create simple bar charts online); Online Calculator; Analogue Clock (a time teaching tool); Table Trees (multiplication tables);
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 numeracysoftware.com  Numeracy Software Solutions
A British site providing teachers with free downloadable resources to support
maths teaching in the primary school. News (much from the BBC), products to purchase (Counting Machine; Using Counting Machine in the Classroom), downloads, and numeracy links.
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 Numerix Bee  Vel Micro Works Incorporated
A math challenge game designed to develop children's interest, confidence, and fluency in mathematics through solving challenging problems while having fun. Register your school.
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 Numicon  Numicon, Ltd.
By representing numbers as shapes, Numicon's teaching program addresses different learning strengths with a multisensory approach. Download free mathematics display resources (for bulletin boards and the like); topics include Numicon shapes, pattern
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 Nummòlt  Maurici Carbó Jordi
Math teaching resources built by architects include base 10 block manipulatives; a block construction toybox; a logic construction toybox; an area workshop; and MathCats balance. See, in particular, Nummòlt's openended obbl & math toys: adding
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 Online Conversion  Fogt
JavaScript for converting lengths and distances, temperatures, speed, volumes, weights and masses, computer memory, date and time, cooking, angles, area, power, energy, density, force, pressure, numbers, finance, light, torque, viscosity, frequency, flow
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 Online Ideas Maths Resources  James Bancroft
Problems in Microsoft Word, HTML, and JPG, organized into general resources; addition and subtraction; multiplication and division; numbers and the number system; fractions, decimals, percentages, ratio, and proportion; real life problems; measure and
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 Online Math League
Math contests for schools and individuals. Sample OML's multiple choice tests by downloading PDFs; register online.
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 Original Lesson Plans  Mathematics  Thirteen/WNET New York
Original Webbased activities developed by Thirteen Ed Online Master Teachers. Each lesson consists of an overview with learning objectives, procedures for teachers, and "organizers" for students  handouts, bibliographies, and other materials. Math
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 Paper Models of Polyhedra  Gijs Korthals Altes
Dozens of paper models of polyhedra: Platonic and Archimedean solids, compounds, caleidocyli, and more. Print the images, cut, and glue them together, or download the models in zipped CorelDraw or GIF format.
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 Pascal's Triangle  Math Forum/USI
A Web unit designed to support workshops given by the Math Forum for the Urban Systemic Initiative (Philadelphia and San Diego). Read about the history of Pascal's triangle and learn to construct it; view illustrations of number patterns to be discovered;
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 Pentomino puzzles  Mike Frost
Rotate pentominoes to tile an 8×8 grid. This JavaScriptpowered online puzzle lets you select from a variety of decorative patterns and graphic designs.
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 Percents (SMILE)  Albert Michael, Robert Fulton Elementary School
A lesson for grades 35 designed to teach students to rename ratios, decimals, and fractions as percents; change ratios into percents; weigh items on a scale; and multiply decimals. From the Practical and Applied Math section of a collection of almost
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 Phenomenological Pizza (SMILE)  Robert Foote, Disney Magnet School
A lesson for the middle grades designed to teach students to calculate the area of a circle, find how many twotopping pizzas can be made using 14 toppings, and determine cost per square inch. From the Geometry and Measurement section of a collection
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 'Picture This': Tangram Puzzles  Sarah A. Keith
Each week a new tangram puzzle is featured in "Picture This" in the Sunday cartoon section of newspapers worldwide. Children are invited to mail their tangrams for possible inclusion, and to be featured in the Kid's Gallery on the Web. Read the legend
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 PiNation.com  Hugh Bell
A site to "... just enjoy pi. Leave the math aside. Don't even think about the circumference of a circle." Create unique representations of the decimal expansion of pi with the PiArt Tool: choose the color for each digit, the number of decimal places,
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 Place Value  Math Forum, Teacher2Teacher FAQ
Answers to a frequently asked question: How do I provide my students with practice on their place value skills?
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