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Math Cards: Quick quizzes in basic math for iPhone and iPod touch.
Quick quizzes in basic math for iPhone and iPod touch.
Features:
- Add, Subtract, Multiply, Divide Cards
- Per-Card Grades
- Grade-as-you-go
- 25 Problems per Card
- Touch quickly to advance
- Touch-and-hold to learn
DollarApp believes in doing one thing well and keeping it simple. This app improves math skill with the built-in lessons on arithmetic, percentage, and letter grades.
Great for kids, moms, and dads alike!
Design by Miguel Elasmar.
Original engineering by William Janoch, additional engineering by Emory Al-Imam.
this is just a dollar store mini planter filled with dry beans (the "soil"). the colored popsicle sticks ("flowers") have math problems on top, and the answer at the bottom. a nice before bed activity: i ask him to pick all the "flowers" of a certain color for me. T says the problem and answers it before pulling it up to check. i make a big show of gratitude for the beautiful flowers as he hands them to me, and he seems real proud of himself. kinda cute.
Math-themed cake I made for a friend's (who has her doctorate in Maths) birthday. Hideous, but delicious and educational. Note: top left corner is the geometry parcel - commonly mistaken as a horrendous experiment with marshmallows.
“How many people have ever lived?” That's the question this graphic tries to answer. I've recently updated it for 2011.
The numbers in this piece are speculative but are as accurate as modern research allows. It’s widely accepted that prior to 2002 there had been somewhere between 106 and 140 billion homo sapiens born to the world. The graphic below uses the conservative number (106 bn) as the basis for a circle graph. The center dot represents how many people are currently living (red) versus the dead (white). The dashed vertical line shows how much time passed between milestones. The spectral graph immediately below this text illustrates the population ‘benchmarks’ that were used to estimate the population over time. Adding the population numbers gets you to 106 billion. The red sphere is then used to compare against other data.
What's different in the 2011 version of Population of the Dead? To start I've included both all time population estimates. White represents the 106 billion conservative estimate while the more liberal estimation of 140 billion is represented by the gray outer zone.
A number of corrections have been included this time around. First, the red circle is actually to scale throughout the image, so all the circles can be easily compared to one another.
When I originally published this, I was eviscerated by a few select mathematicians who pointed out that using the radius or diameter as the basis for scaling the circles was incorrect. One blogger gave me a much appreciated math lesson which motivated me to update the graphic. I'm still not a math guy, so if the numbers are still wrong forgive me. I did use the area this time, not the diameter.
However, I'd also like to restate that proper math isn't exactly the point of this image. One viewer, Andrew Liebchen, says this far more elegantly than I can in a comment he left for me, "In some ways, the circle within the circle is poetic. It implies that in time, all the living will die; the that is red will become white. Meanwhile, new births will forever increase the overall area." In short, the point is to reflect on the scale of life and death. ;-)
Finally, I'd like to thank everyone who's viewed or promoted this image! 111,920 have viewed it on Flickr alone, but it's been posted and reposted all over the web on sites like Visual.ly, Digg, Reddit, Dzone, and DesignFloat. I've also spotted prints in the wild. Thanks everyone, truly flattering!
Research Notes: The research used to create largely came from this article from The Scientific American, published by Ciara Curtin on March 1, 2007. Her article cites Carl Haub, a demographer at the Population Reference Bureau, and Joel Cohen, a professor of populations at the Rockefeller and Columbia Universities in New York City, as sources. A number of other sources were used including research from the Forum of the Future, the Population Reference Bureau, Jeffery Sachs Blog and publications by the United Nations.
View the High Res copy
Update Jan 29, 2010: Fixed Spelling Mistake
Update Feb 11, 2010: Proceeds from this graphic now being donated to One Million Bones
Update Aug 27, 2011: 2011 version released
Originally published at appfrica.net/blog/2009/11/16/population-of-the-dead/
as u see i am studying for an upcoming test in math
(da3awatkum ya e5wan)
and so i just wanted to share a little bit of wat am doing and also see if there is any one who knows math to see if am correct or not :p
Maybe the problem wasn't worded correctly? Maybe my Sprite is just too creative for math tests?
This is from a Math Mammoth placement test.