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Archive for the ‘Math’ Category

The price of gas keeps going up.  In California, most gas stations now charge over $4 even for the lowest octane gasoline.  Hybrid cars cost more, but are more energy efficient than most standard gasoline-only cars.  Hybrid cars are also better for the environment.  Are they better for your wallet as well?  Let’s figure out the break-even time for a hybrid car, and how much money you could save over the lifetime of a hybrid car.

Find out how to do this problem!

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Sally wants to do a home improvement project.  Her kitchen floor is in bad shape and she wants to retile the floor.  She needs to figure out how many tiles to buy.  Her kitchen measures 15’ by 20’.  She will use tiles that measure 13” by 13”.  The tile costs $3.50 per square feet.  How many tiles does she need to buy and how much will the tiles cost?

Find out how to do this problem!

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Last month we talked about compound interest. This month we will use the compound interest concept and do a real-world problem, a kind of exercise often performed by financial analysts.

Netflix is a company that provides movies for viewing, either by streaming online or by mailing a DVD to your home. As a company, it has done extremely well. Its revenue (the total amount of money it receives from all of its customers) was $1.21B (billion) in 2007, $1.36B in 2008, and $1.67B in 2009. Here is the problem: What was Netflix’s average revenue growth rate from 2007 to 2009? If it continues to grow at that rate, how big will the revenue be in 2015?

Find out how to do this problem!

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Our flash cards were just launched. We believe the flash cards provide another tool to help students polish their math skills. We are starting with four subjects (addition, subtraction, multiplication and division), each with three levels of difficulty (easy, medium and hard). You can customize the flash cards to set how many problems per set, and whether or not you want a timer running during the practice. At the end, you will get a score and you can review problem by problem how you have done. To check it out, give it a try: GoldStudent Math Flash Cards.

GoldStudent Flash Cards - Options Screen

GoldStudent Flash Cards - Question and Answer

GoldStudent Flash Cards - Score and Review

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Source:    http://republicofmath.wordpress.com/2011/01/01/happy-mathematical-new-year-2011-is-the-sum-of-11-consecutive-prime-numbers/

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We have estimated that each year about 100 million Christmas trees are sold in the U.S.. I was wondering how much land it would take to plant and grow these trees. Can you estimate this number?

Let’s assume that it would take 7 years for a tree to grow big enough to be cut down (6 to 12 years is a reasonable range).

Find out how to do this problem!.

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Happy Holidays
Happy holidays! The first semester of school is coming to an end. Some of our students are preparing for end-semester exams, and we are getting ready for the holidays. This is a good time to relax and recharge, to reflect on the past and to plan for the future. We wish you all a happy holiday season!

Recently I had a chance to attend a meeting where I heard Salman Khan speak. He is the founder of Khan Academy. This is a website that offers many free educational videos, hosted on YouTube, covering a wide range of topics. These videos focus on teaching one concept at a time. I like the visual way of teaching. Check it out at www.khanacademy.org. These videos are good complement to the worksheets we provide at GoldStudent, which help children master a math concept.

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