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.

## Archive for the ‘Math’ Category

## Problem of the Month – April 2011

Posted in Education, Math, Problem of the Month, Teaching Math, tagged energy efficient, gas price, gasoline, hybrid cars, problem of the month on April 23, 2011| Leave a Comment »

## Problem of the Month – March 2011

Posted in Education, Math, Problem of the Month, Teaching Math, tagged home improvement, online math, problem of the month, problem solving practice, real-world problem, square feet, tiles on March 24, 2011| Leave a Comment »

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?

## Problem of the Month – February 2011

Posted in Math, Problem of the Month, Teaching Math, tagged compound interest, grow rate, Netflix, online math, problem of the month, problem solving practice, real-world problem, revenue on February 10, 2011| Leave a Comment »

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?

## New Site Feature – Flash Cards

Posted in GoldStudent, Math, Math Help, tagged addition, division, easy math, elementary math, flash cards, learn math, math education, math flash cards, math worksheets, multiplication, school, subtraction on January 20, 2011| Leave a Comment »

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.

## Happy mathematical new year: 2011 is the sum of 11 consecutive prime numbers

Posted in Education, Funny Math, Math, tagged 2011, happy new year, Math, prime numbers on January 3, 2011| Leave a Comment »

## Problem of the Month – December 2010

Posted in Math, Problem of the Month, Teaching Math, tagged christmas trees, estimation problem, Math, math problem, problem of the month on December 27, 2010| Leave a Comment »

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).

## Happy holidays from GoldStudent!

Posted in Education, From Ning, Math Help, People, Teaching Math, tagged Education, holidays, Khan Academy, khanacademy.org, knowledge, learn math, learning, math tutorials, math videos, Parenting, Salman Khan, school motivation on December 23, 2010| Leave a Comment »

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.