Category Archives: Algebra

Green Olives

My 7th graders are working on “percentages of” problems currently, and late last night, I saw this problem on one of Don Steward’s handouts. There are 75 olives, 40% of which are green. I eat some of the green olives until 10% of the olives that remain are green. How many green olives did I […]

Also posted in Course 2 (7th Grade Math) | | 11 Responses

Solving an Equation with a Fraction

From CPM: The Sutton family took a trip to see the mountains in Rocky Mountain National Park.  Linda and her brother, Lee, kept asking, “Are we there yet?”  At one point, their mother answered, “No, but what I can tell you is that we have driven 100 miles and we are about 2/5 of the way there.” […]

Also posted in Course 1 (6th Grade Math), Math 8 | | 6 Responses

dudamath.com

Ethan Hall, teacher and web entrepreneur from Israel, emailed me this morning asking me to check out his visual patterns generator on dudamath.com. There’s a lot of cool graphing tools other than the VP generator. I’m kinda blown away. Go play! Go do math!

Also posted in Course 1 (6th Grade Math), General, Geometry, Math 8, Problem Solving | | 5 Responses

Desmos Puppy House

We don’t cover quadratic in Math 8 this year, so we really can’t do Des-man. I come up with “Puppy House” instead so my students can still create something that allows them lots of practice with writing linear equations with domain and range restrictions. They draft the house on paper. The house needs to have a minimum of 6 […]

Also posted in Math 8 | | 3 Responses

I’m always happy to hear how teachers use visualpatterns.org with their students. Michael Fenton shares how he uses the patterns with Desmos. And this. Alex Overwijk’s students use the big whiteboards. Whiteboard photos of http://t.co/ajYFLzRQSU that my S’s did yesterday….thanks @fawnpnguyen#mtbos#mathchatpic.twitter.com/UZd3HPfyoL — Alex Overwijk (@AlexOverwijk) March 7, 2015   Bridget Dunbar removes some figures, and […]

Also posted in Course 1 (6th Grade Math), Math 8 | | 13 Responses

Teaching Absolute Value

I know Common Core does not have absolute value in grade 8, but I’m teaching it anyway because we’re still doing “algebra 1” this year. (A year ago Raymond Johnson looked into the inclusion of this topic in the different grade levels.) My 8th graders know that the absolute value of 5 is 5, and the absolute […]

Posted in Algebra | | 1 Response

Barbie Bungee Revisited and Better Than Yours Class Lists

This year I’ve taken away a lot of my step-by-step instructions for the Barbie Bungee activity that I’d posted 1.5 years ago. They get no handouts, only some verbal instructions: See that gob of tape up there? That’s leftover tape from previous years where Barbie had taken her jump. It should be at 3 meters up. Well, […]

Also posted in General | | 6 Responses

Hotel Snap

[NCTM Illuminations has my blessings and thanks to re-write and feature this lesson on their site.] Andrew Stadel and I recently presented this task at the 2013 CMC‘s North and South Conferences. The Challenge As a team, build a hotel that yields the highest profit [score]. Rules and guidelines for building the hotel Each cube represents a […]

Also posted in Course 1 (6th Grade Math), Geometry, Problem Solving | | 15 Responses

Vroom Vroom

I normally share a lesson that I’ve already done with students, but I’m still tweaking this one and needing to write some thoughts down before my noggin turns back into soft tofu. I bought these 14 pull-back friction toy cars (2 sets) for \$30 at Costco. Amazon posts a video of how well these soft squeezable cars […]

Posted in Algebra | | 7 Responses

“Working Together” Problem

[The title of this post in the old blog was actually “if there’s cold beer in the fridge.” It’s dumb, but I did end the post with “Forgive me for being such a delinquent, but my last day of school is not until June 21. I’m losing it.” So I have an excuse for everything.] Heya, back-to-back […]

Also posted in Problem Solving | | 1 Response
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