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I believe that mathematics should be taught, not collaboratively explored; algebra and geometry are better than a vague course of Integrated Math; spiraling doesn't work nearly as well as learning it properly the first time; "I don't DO math" should be an incentive rather than an excuse. "I don't DO English" should be treated the same way.
Fresh from today's test: Nominated by @MathsPadJame , Seriously? Nix The Tricks , Dammit! I'm trying to hold it tog...
I teach my kids to solve problems like these using rectangles. I wrote about it here: http://fawnnguyen.com/2012/12/26/20121226.aspx
ReplyDeleteThank you!
I figured 15 days. The 12 painters got 6 days of work done, which left 12 days' worth of work left, but then they had 4/3 the labor hours after that, so that would cut the remaining days needed to 9 hours; 9 + 6 = 15 ... ?
ReplyDelete4/3 the workforce, I mean, so that 12/(4/3) = 9 . Gah.
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