May 7, 2013, 7:33 pm
I lost a bet with my friend and colleague Dave Coffey (remember him?) over the NCAA mens’ basketball tournament, and as a result, I owed Dave a guest post on his blog DeltaScape. Risky move on his part, in my opinion, since his blog is a consistently excellent source of wisdom about math education and teacher training. I hope I didn’t mess it up too much — my guest post, entitled “Does this make sense?” is about so-called sense-making activities and what they mean for math instruction. It can be found here. Enjoy!
December 24, 2012, 3:34 pm
It’s not Thanksgiving, but during this season I’m very thankful:
- For all of you who check in on this blog from time to time, who have it in your RSS feeds, and who add your comments.
- For the Chronicle, for having the momentary lapse in judgment that led to me being part of the blog network since last fall.
- For the Chronicle web development team, working behind the scenes to keep all these sites up and running.
- For my online friends from Twitter and Google+ who interact with me these and give me a tiny slice of a tight budget of attention.
Being able to write about math, education, and technology here at Casting Out Nines is a great privilege. I’m humbled to be able to do it, and I’m looking forward to good conversations in 2013.
I’m taking the rest of this week off to hang out with my wife and kids and friends. In the meanwhile, enjoy Christmas. In my Christian faith…
July 27, 2012, 9:25 am
I’ll be at MathFest next week, and one of the things I’ll be doing is participating in this panel discussion. I’ll be speaking about “Finding Your Second Job” and then leading a breakout group to discuss this issue. It’s a little funny that I’ll be speaking on this, since I’m actually on my third job right now (and I hope it will be my last one!) but I won’t let that get in the way.
Finding “the next job” in academia is a very complex issue on a number of levels. I only have 15 minutes to do my schtick in Madison and so there’s no way I can touch on all the nuances. So I’d like to take this week leading up to MathFest to blog about this issue in detail. There may be some people out there who are planning to go on the market in the fall — or wrestling with the possibility of doing so. If you can make it to MathFest, I encourage you to stop by the panel…
December 26, 2011, 6:33 pm
I want to wish all of you folks out there a Merry Christmas. (I know not all of you share my faith tradition, but allow me to wish it to you anyway.) I hope you have been able to enjoy the season, and if you’re in academia, I hope you’re enjoying the break between semesters.
I also just wanted to announce that I’ll be taking this week off from blogging and will resume posting on January 2. I’ll be heading out to Boston for the Joint Mathematics Meetingsat 6am on New Year’s Day and hope to do some blogging from the conference while I’m there. If you’re at the meetings, I hope you’ll consider attending my talk Making proofs click: Classroom response systems in transition-to-proof courses at 10am on Wednesday in the Back Bay Ballroom D, 2nd Floor of the Sheraton. I’ll also be attending the MAA minicourse on discrete and computational geometry prior to the meetings, so maybe I’ll see…
September 20, 2011, 8:00 am
This Thursday (Sept 22) at 2:00 PM EDT, I’ll be giving a webinar for AMATYC called “Flipping the college classroom”. This is all about the flipped, or what I call the “inverted”, classroom — what it is, why it could be a better model for student learning, how it’s been implemented at the college level, and tools and strategies for flipping your own classroom. This is a subject near to my heart, as CO9′s readers know, and it’ll be fun to talk about it. It’ll be my first-ever webinar, and I think it’ll be an interesting experience, even as I pray for no massive tech screwups.
Although it’s an AMATYC event, registration is now open for the general public. Just click here and register yourself as a visitor.
September 19, 2011, 8:00 am
Last week in this post, I asked for requests for math topics you’d like to read about. One person wrote in and asked:
Why don’t you enlighten us about the name “Casting Out Nines?” I learned a system in grade school with the same name –it was a way of checking multiplication and long division answers. Long before calculators.
A review please?
OK then. Casting out nines is an old-fashioned method of checking for errors in basic arithmetic problems (addition and subtraction too, not just multiplication and division). Here’s how it works, using addition as an example.
Let’s suppose I’m trying to add 32189 to 87011. I get a sum of 119200. But did I make a mistake? Do the following to check:
- Take the first number, 32189, and remove — “cast out” — any 9′s…
September 5, 2011, 2:06 pm
Greetings! I want to welcome everyone to the new digs for Casting Out Nines, my blog on math, education, and technology. This blog has been around since December 2005, but this is the first official post on this blog as part of the Chronicle of Higher Education blog network. All the old content has been (as far as I know) ported over to this new site, so you’re not missing anything by not going over to the old site.
I’m really pleased to join the blog network, and I look forward to some good conversations coming up.
August 20, 2011, 1:34 pm
Photo by adam*b, http://www.flickr.com/photos/atbartlett/
My family and I are all settled (well, mostly) here in Michigan, and pretty soon I’ll be in full swing in my new position at Grand Valley State University. I can’t overstate what a delight it’s been, getting situated at GVSU. It is a dynamic and forward-thinking university full of great people and exciting ideas. I haven’t met a single person who isn’t excellent at what they do and generous with their expertise.
I am officially taking CO9s off hiatus, and I intend to pick up the pace on blogging as the semester kicks off. That seems wrong — shouldn’t I blog more when it’s less busy? — but I’ve always seen blogging as both an overflow mechanism (to think more about what I’m doing) and an incubator (to kick off new things by rehearsing them here).
June 23, 2011, 7:11 am
Image via Wikipedia
It’s been pretty quiet around here at Casting Out Nines lately. This is mainly due to two things. First, I’m spending five days a week home with my oldest two kids — the youngest joins us on Wednesdays — and keeping the kids active and engaged doesn’t leave much time for blogging. Second, as you all know, I’m starting a new position at Grand Valley State University in the fall and our big move to Michigan takes place in two weeks. We’re totally uprooting in this move, and preparing for it consumes a lot of time and emotional energy.
I’ve decided that, in light of all this, that I might as well declare the blog to be on hiatus for a month or so until we’re settled. There are a couple of posts that might go up soon — one of them being the last entry in the How I make screencasts series — but…
April 21, 2011, 3:16 pm
I wanted to announce to all you readers of this blog that some big changes are coming up soon for my and my family. This doesn’t really affect the blog, but you might like to know. I’ll be leaving Franklin College, my place of employment for nearly ten years, after this semester to accept a new position as Associate Professor of Mathematics at Grand Valley State University in Allendale, Michigan. My first official day at GVSU will be August 8, and we’ll be moving up to the Grand Rapids area probably in mid-July.
This has been a truly gut-wrenching decision to make, since Franklin has been extremely good to me for the last 9+ years, and I hope that I’ve done some good for the college and its students as well. It’s also a decision that’s been cooking for months, but for obvious reasons I couldn’t blog about it. In the end, though, I made the choice to go to GVSU for three reasons.
- I was…