'Cheryl's Birthday' Problem Gets the Internet Talking About Math
It's been a tough year for parents trying to keep up with their kids in math.
Last March, a North Carolina father tried to help his son with a word problem and ended up writing a note to the teacher saying that, despite having a degree in engineering, he couldn't figure it out. Both the note and problem went viral.
Then last week, this high school problem from Singapore made the rounds on the Internet:
The Singapore television host who posted the problem wrote that it was for students in the equivalent of 5th grade. That made some parents panic.
I won't spoil the fun and attempt to explain the answerbut you can find excellent explanations of how to figure it out here, here, and here. (Several sites have reworded the problem as well for clarity.)
Since the problem was posted, much has been made of the fact that Singapore scores well above the United States on the Program for International Student Assessment, a global assessment of 15-year-olds. In 2012, U.S. students scored an average of 481 in math, while Singapore's students scored an average of 573. Twenty-nine nations outperformed the U.S. to a statistically significant degree, and Singapore was outscored by only oneShanghai-China.
But there are always caveats with PISA scores, so perhaps a better comparison is this: What percentage of math olympians in Singapore got the correct answer to the problem? And what percentage of the top 40 percent of U.S. high school students could do the same?
In any case, it's been fun to see the Internet struggle with and endlessly debate a logic problem. There's been so much of this that the Math Olympiad group posted an entire explanation of why one particular answer that many people online have argued for is wrong.