David Walker

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**Lesson 6-5: Congruent Figures (Day 65)**

Today is the last of four days of subbing in the eighth grade Algebra I class. This week represents a major opportunity for me to practice teaching math to real live students. (It's just too bad for readers of this Geometry blog that it's an Algebra I class...

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**Lesson 6-4: Miniature Golf and Billiards (Day 64)**

Today is the third of four days of subbing in the eighth grade Algebra I class. This week represents a major opportunity for me to practice teaching math to real live students. (It's just too bad for readers of this Geometry blog that it's an Algebra I clas...

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**Lesson 6-3: Rotations (Day 63)**

Today is the second of four days of subbing in the eighth grade Algebra I class. That's right -- I find out today that the regular teacher will be out the entire week. Thus this week represents a major opportunity for me to practice teaching math to real li...

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**Lesson 6-2: Translations (Day 62)**

Today I subbed in an eighth grade Algebra I class. I've subbed before both at this school in general and in this class in particular, but neither since May. Here are a few things to note about this school: Like all middle schools in the district, this schoo...

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**Lesson 6-1: Transformations (Day 61)**

Today on her Mathematics Calendar 2018 , Theoni Pappas writes: If a circle's diameter is 3 times another's, then how many times greater is its area? Let's call the diameters of the two circles d and D , so that D = 3 d. Then the area of the smaller circ...

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**Chapter 5 Test (Day 60)**

Today I subbed in a high school history class. This is actually in my old district, the one that follows the blog calendar as Day 60. It's the end of the trimester -- at least, it would be if the high schools in this district actually had trimesters. (In my...

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**Chapter 5 Review (Day 59)**

Today on her Mathematics Calendar 2018 , Theoni Pappas writes: If this circle's equation is x ^2 - 10 x + y ^2 + 4 y = 20, what is its radius? As I've mentioned in the past, I used to consider this to be an Algebra II problem, but the Common Core has pus...

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**Chapter 5 Review (Day 58)**

Today is the review for the Chapter 5 Test. This is what I wrote last year about the worksheet for today's review: There are many important concepts covered on this test -- isosceles triangles, quadrilaterals, and parallel lines. Here are the types of quest...

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**Lesson 5-7: Sums of Angle Measures in Polygons (Day 57)**

Today I subbed in a middle school special ed class. But there are major differences between this teacher's schedule and those of most other special ed teachers. General ed teachers typically have five classes. Special ed teachers in this district usually te...

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**Lesson 5-6: Alternate Interior Angles (Day 56)**

Today I subbed in a high school special ed math class -- at a different school from yesterday. So let's dive straight in to "A Day in the Life." 8:00 -- Second period is an Algebra 1B class. This class is on the very same unit as yesterday's class, namely ...

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