Beautifully done!
Do you know why this proof works? How can we be sure the red and yellow areas don’t change as they slide around?
[Photo by Scott Schram via Flickr.]
For Leon’s Christmas gift, Alex made the Graph-It game. She wrapped a pad of graph paper and wrote up the instructions:
To play Graph-It, one person designs a picture made by connecting points on a coordinate graph. He reads the points to the other player, who tries to reproduce the picture.
The Math Teachers at Play blog carnival is open for your browsing pleasure at An “Old Math Dog” Learning New Tricks. Topics include:
Alexandria Jones struggled to think of a Christmas gift that a one-month-old baby could enjoy, but finally she got an idea.
She cut empty cereal boxes to make regular polygons: 6 squares, 12 regular pentagons, and 32 equilateral triangles. Using small pieces of masking tape, she carefully formed the five Platonic solids. Then she mixed flour and water into a runny paste. She tore an old newspaper into small strips and soaked them in the paste. She covered each solid with a thin layer of paper.
Thank you to Dan at Math 4 Love, who pointed me to Vi Hart’s math doodles. (The rest of her page is well worth exploring, too!) Kitten really enjoyed this one and immediately sat down to create her own version of the OuroBorromean Rings…
Recognize that every math program, whether more traditionally skill-based or reform-oriented (more problem-solving, projects, less drill) has its merits and its weaknesses. Whether you believe there is too much emphasis on basic facts (less likely!), or not enough, you can supplement with the myriad of resources on the web.
— David Marain, MathNotations
Odds and Evens Week of 12-1-10
Click through to the original post for a counting puzzle, plenty of advice on helping with your child’s math homework, useful math links, and a couple of “cute 3-year-old” stories.
And remember that one of the best ways to supplement any math program is by playing games.
Homeschoolers, you can have your math and enjoy it, too! Play a mathematics game every day until Christmas at nrich.maths.org:
[Photo by rdesai.]
The MIT Mathmen got the ball on their own 20-yard line for the last drive of the game. They were down by 2 points, so they needed at least a field goal to win the game.
If quarterback Zeno and his offense advanced the ball halfway to the opposing team’s end zone on each play…
For the rest of NaBloPoMo (National Blog Posting Month), my other blog is featuring a logic game or puzzle every day. So far, I’ve shared three of my online favorites:
And there’s plenty more fun to come. Drop in every day until December to see a new puzzle or game:
[Photo by gabi menashe.] This story is continued from Alexandria Jones and the Eighty-Yard Drive…
There was a time-out on the field, and the Jones family sat down for a brief rest. Sam asked, “How do babies decide when it’s time to be born?”
“Well, son, it has to do with numbers. You see,” Uncle Will explained, “the baby spends his first month thinking about the number one.”
“That’s not much to think about,” Sam said. “But I suppose he can’t handle much at that age.”
Denise Gaskins' Let's Play Math 