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895 posts tagged with math.

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## How can I teach someone high school math in 6 months?

There's a smart freshman who's going to be in my school's Academic Decathlon team next year. However, Academic Decathlon tests over all of high school math, so I ask: How can I teach a fast learner an overview of high school math in around 7 months? [more inside]

## Algebra for Social Scientists

I tutor several people in a "Mathematics for the Social Sciences" course at a local university. This semester the material is focused on matrix algebra. For the most part, they have no trouble wrapping their heads around the notions of basic vector operations, row reduction, systems of equations, inverse matrices and determinants. But, they have a lot of problems with more abstract concepts such as linear independence, subspaces, basis and dimension. I'm wondering if anyone has any tips on helping them visualize and understand these ideas more clearly.

## Math is cool, right?

[Math filter] What fascinatingly cool mathematical topics do you wish you knew about in high school? [more inside]

## Calculating standard deviation on compounded investment returns

Is it possible to estimate the standard deviation of an investment's return after "y" years, if you know the investment's mean annual return and standard deviation? [more inside]

## Bingo game with pregenerated winners?

How do I generate a bingo game with a predetermined number of winners? I'll have control over the cards printed and over the list of numbers to be called out. (Specifically, 15 winners out of 15,000 cards.)

## How to convert lat/long to x/y on Lambert Conformal Conic.

Math/mapping question: I'm trying to use a formula to convert latitude/longitude into x and y values on a map. What are the reference longitude, reference latitude, and the standard parallels? [more inside]

## Why do we use radians?

What's the advantage of using radians instead of degrees? I've never had a satisfactory answer to this. In high school, we always used degrees to measure angles and starting in university we switch to radians. Is there really any benefit to using radians?

## Past performance, future results, &c

Statistics-filter: I need to establish to what extent student performance on a particular standardized test is predicted by each of the following: GPA, standardized test scores and a couple of other miscellaneous numerical factors. How do I go about this? [more inside]

## How many SMS messages fit on a floppy?

Mathfilter: How many text messages (SMS) will fit on a floppy disk, or a CD-ROM? Once that number is derived, how much will it cost to send or receive that many messages if a consumer pays per message (American carriers or Intl carriers would be great)? [more inside]

## Beautiful Equations

Inspiring books about mathematics and statistics? [more inside]

## Its time to get mathy.

HindsightFilter: Due to a lack of perspective I didn't give math the attention I should have. I want to now. [more inside]

## How do I learn to like research?

## Color algebra: How do I pick a color F will make known color C against known background B at opacity N?

Color algebra: Given a color C, how do I pick a color F that will

**be**color C when against background color B at opacity N? How would I do the same thing for a color multiplication? [more inside]## Math for pre-schoolers

My cousin's four year old son is obsessed with things like quarks and infinity. He insists to his mother that infinity is the last number. She isn't so sure, and wants to know more about things like strangeness.
I don't want to determine this kid's future, but it seems fun to feed his curiosity. And since my wife's babysitter was Murray Gell-Mann, the responsibility has fallen partially on my shoulders to help answer his questions. What kinds of information can you recommend that I give to his mother so that she, an attorney and not a mathematician, and her son can learn more about this information. In particular, what kinds of books, games, and projects would introduce him to other neat ideas in mathematics and physics?

## Practice Makes Perfect

Help me build a database of math problems to keep my skills sharp. [more inside]

## How do I calculate the slope of two points in three dimensions?

How do I calculate the slope of two points in three dimensions? For example, what is the slope of the line that passes through points A(-5,-5,7) and B(3,0,5)? Please show your work. This is not a homework question. [more inside]

## Using conditional formulas to sum up data in Microsoft Excel

Can I use Excel to loop through lists of names and sum up numbers for each name, without having to define the cell ranges that correspond to each name? [more inside]

## Where can I find which quantitative/technical skills are hot, and which ones aren't?

Where can I find which quantitative/technical skills are hot, and which ones aren't? [more inside]

## Podcasts about statistics

I'm taking statistics math this semester, and I'm wondering if there be any geeky statistics math-related podcasts that will help me wrap my head around this tricky subject matter (and maybe even enjoy it). [more inside]

## It's been 24 years. I give up.

My geometry teacher in high school in 1984 showed us this puzzle. I was only half paying attention, but I believe the goal was to draw a line that intersected each segment only once. [more inside]

## Russian Roulette Odds

Please settle an ill-informed bar argument re. Russian Roulette. [more inside]

## Coin flip odds?

Statistics question: How can I calculate the odds of flipping a coin to get x consecutive heads anywhere within a data set of y flips. (more inside) [more inside]

## My Dark Calculus II Secret

Calculus II filter: I have trouble setting up the integral for the volume of a solid of revolution when it is being revolved around a horizontal or vertical line other than the x- or y- axis. Does anybody know a trick or mnemonic for these types of problems? [more inside]

## does doing math make you better at it?

Does doing math improve one's aptitude at math? [more inside]

## complex dice probability make head esplode

I need a tool to help me analyze the probability of certain events occurring regarding a pool of X dice for a game I am creating. See my examples below.
[more inside]

## lead lead everywhere

California has a new law that specifies limits for lead in jewelry products. Even though the answer to my question should be a no-brainer, I need to confirm: [more inside]

## How can I round prices in Excel?

In Excel 2007, I need advice on how to round a series of prices to either a $0.50 ending, or a $0.95 ending. [more inside]

## How many rolls 'till n values in a row.

Given a fair die with

*s*sides, what is the expected number of rolls*r*before I get*o*outcomes with the same value*v*in a row? [Note this is emphatically**NOT**a homework problem; I just really want to know, feel like I should be able to figure it out, can't, and it is driving me nuts.] [more inside]## Help a first-time tutor get started!

FirstTimeTutorFilter: I'm plan to start tutoring Math, Chemistry, Physics and possibly ESL in January. Only problem is, I have *no idea what I'm doing*. Anyone have any textbooks, general teaching books, online certification courses, etc to recommend? [more inside]

## Rainy day math problem!

How many different conversations can six people have?
[more inside]

## Tips for university teaching

Teaching a university course for the first time: any tips or suggestions?
[more inside]

## What is bigger than alot or a shitload?

My son asked me how many trees there are in the world. I know there are a finite number, yet I also know that it is not practical to count them. Same with grains of sand. When the set cannot be measured because it goes on forever we say the set is infinite. Is there a single word to express the concept of a countable, finite number too large to actually count? [more inside]

## Make a function of this graph. That's like an anti-graph!

Help me create a function from a graph, details inside. [more inside]

## Parts Per Hundred or Parts Per One?

What is the TERM for the three-decimal place, fraction-of-one "percentage" format used in baseball statistics? [more inside]

## Long time listener, first time caller

I'm failing Trig. What would be a good makeup assignment to suggest to my teacher? Do college teachers even do that kind of thing? [more inside]

## Why the inconsistent derivatives?

Where am I going wrong with this (very simple) implicit derivative? [more inside]

## How to scale corner radius based on a logarithmic scale

Is there a method that exists for defining corner radius on a drawn box in Illustrator which scales proportionality based on a logarithmic scale that is directly related to the size of the box. [more inside]

## Help me prove to myself that I am capable of passing a basic Calculus course!

Where can I take (or simulate taking) a basic calculus course for free or cheap. I don't care about credits or anything, I just need to defeat calculus. This time, it's personal. [more inside]

## #2 pencil - 20 years = x qty remedial math classes

Bonehead Math Filter: What sort of math is on the NJ College Basic Skills Placement Test [more inside]

## I feel like I dont know you anymore, math.

How do I make the transition, in my brain, to studying graduate/advanced mathematics? [more inside]

## Me need mor math and chemistry

Does anyone know of any one-year science-ish programs for those who have a bachelors, but who want to bulk up on science and/or math. [more inside]

## Inequalities and direction-flipping

Why is it that when I solve the inequality 0 ≤ arccos(x) <> cos(π/4)? Why do the operators switch direction? [more inside]

## mathematics chess book?

is there a book on the mathematics of chess? [more inside]

## Does the study of math sharpen critical thinking skills?

If a man’s wit be wandering, let him post a question about mathematics and reasoning to MetaFilter. [more inside]

## Details of the German Tank Counting Method.

Details of the German tank counting method (as seen on reddit)? [more inside]

## Difficult as ABC

ABC x D = BADC. What single numbers (1-9) do the letters represent?
Is there any way to arrive at the answer (a) by logical deduction all the way rather than with some trial-and-error and (b) so that a 10-year-old can follow the logic?
[more inside]

## looking for a sign

Is there a symbol for the phrase "and/or"? [more inside]

## It felt like I cheated...

## We Don't Need No Stinking Derivatives

Obscure Mathfilter: In the arcane past of mathematics, there is something known as a "Newton Polygon", which theoretically can be used to help sketch functions of two variables, say, x^3 + y^3 =3xy, for instance. But -- [more inside]

## Question about Number Theory Text

Question about Hardy's "An Introduction to the Theory of Numbers". [more inside]