Monthly Archives: September 2012

19 – fractals

We made these in geometry. Kristen Fouss has really pretty ones.

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18 – frog leaps and beach ball

I started the frog leap problem with my algebra class by having 6 kids act it out. My geometry kids did segment and angle bisector constructions that lead to a cool theorem. The kids called it “beach ball.”

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17 – Fermat’s last theorem

We watched this video in its entirety (2 periods) in geometry. Such a lovely story — watching it always makes me tear up. I think the kids really gained a deeper respect for the beauty of a “rigorous proof” and the interplay among different fields of mathematics. It was cool for them to hear new stuff, like: […]

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16 – arranging whole numbers

My geometry kids worked on this fun problem: Below is an orderly way to arrange the whole numbers.  What number is directly above 100?  Directly above 1000?  What is a way to tell what number is directly above any given number? . . . 16    17    18    19    20    21 11    12    13    14    15 7      8      9     10 4      5      6 2      3 1 […]

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15 – Tanton’s exploding dots

Oops, I completely forgot to take a picture today of my 6th graders working on a similar activity as the algebra kids did! But I took a few pictures of our first Math Teachers’ Circle monthly meeting!! It went really well, and I’m so proud to be part of our great team. Nate presented James Tanton’s “exploding dots” lesson. Jeff […]

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14 – pigeon hole principle

It’s Friday and my geometry kids finished working with “if-then” statements during the first hour; so in the second hour, I gave them this problem: Five Couples Jake and his wife recently attended a party at which there were four other married couples. Various handshakes took place. No one shook hands with himself (or herself) […]

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13 – interpreting algebraic expressions

I’m so happy with how well this sorting/matching “Interpreting Algebraic Expressions” activity is turning out! They match an algebraic expression to an area model to a verbal expression then to function table. Great discussions so far! Kids white-boarding another pattern activity: House of Cards. I’m leaving these boards up for tonight’s Back-to-School Night!

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12 – inspired by Kate’s post

So, yeah, Kate’s post today inspired this extension of an otherwise not-so-hot construction of segment bisectors. #nguyening  

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11 – lazy block game

The 6th graders LOVED the Block Game (my lazy version)!!! I wish you could hear the interaction — lots of happy mathy noise.

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10 – Mr. Stadel’s water vase

Last week was the first time I used a 3-Act lesson for a weekly PS. I used Andrew’s Water Vase with my geometry students. (The kids had to ask for information they think they’d need to solve the problem. If they asked for radius and area, I only gave the radius.) I purposely assign a weekly PS that’s […]

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