Search Results for: rectangles

Multiplication: Finding the Greatest Product

From a set of 1 through 9 playing cards, I draw five cards and get cards showing 8, 4, 2, 7, and 5. I ask my 6th graders to make a 3-digit number and a 2-digit number that would yield the greatest product. I add, “But do not complete the multiplication — meaning do not figure out the […]

Posted in Course 1 (6th Grade Math) | Tagged , , , , , , | 23 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 […]

Posted in Algebra, Problem Solving | Tagged , , , , | 1 Response

Venturing Into the Sequel of Penny Pyramid

I didn’t get around to doing Penny Pyramid when I first saw it last year. But Dan‘s 3-post series and Nathan‘s recent mention of it were the reminders I needed to make it happen. Act 1 how many pennies how much money is that how long did it take who in their right mind would do this/who has that patience how much […]

Posted in Algebra, Geometry, Problem Solving | Tagged , , , , , | 2 Responses

Sleep On It

This lesson mattress_sizes1 is the result of my spending 4 nights sleeping on a really nice bed wrapped under thousand-thread-count sheets! Part 1: The Mattresses I asked the kids to guess how the size of the little rectangles on paper compare to the real mattresses. (It’s 2% of actual.) We ignored the thickness. Then I asked them what the scale […]

Posted in Course 1 (6th Grade Math) | Tagged , , , , , , , | 3 Responses

Lego Pieces and Feasible Region

This afternoon I came across a tall stack of Lego® boxes stored in my son’s closet; they reminded me of a lesson. (My son just turned 20 three days ago. I can still see him playing with his Lego sets for hours on end when he was younger. And when he ran out of floor space […]

Posted in Algebra, Problem Solving | Tagged , , , , , | 12 Responses

Dissecting Polygons

I appreciate any math lesson where I give the students minimal instruction, yet the lesson is rich in content and it gets kids to do math. (I’m learning to do more and more of not doing much.) Each student got two pieces of grid paper. Part 1 In portrait orientation, fold paper in half vertically and approximately into thirds horizontally. Unfold paper […]

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Investigating Area With Paper Folding

Last Thursday was a half-day for students because we had Open House in the evening.  I decided it was a good day for my geometry students to do some paper folding.  I gave each student about 5 sheets of hamburger patty paper and these instructions: Task 1: construct (by folding) a square that is 1/4 the area of the […]

Posted in Geometry, Problem Solving | Tagged , , , , , | 7 Responses