Author Archives: Scott Baldridge

About Scott Baldridge

Distinguished Professor of Mathematics, LSU. Geometric topologist: gauge theory, exotic 4-manifolds, knot theory. Author: Elementary Mathematics for Teachers.

Singapore Math Adds up for US Teachers

A radio interview I did with Voice of America in 2010. Listen to two of my favorite teachers: Johnette Roberts and Gertie Walls! Continue reading

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Singapore Math Growing in Popularity

An interview with Kim Covington and 12 News from July 1, 2010. Continue reading

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Math Expert Dr. Scott Baldridge on “Singapore Math”

Watch one of my first television interviews. You can easily tell how nervous I am! Continue reading

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Autumn Multiplying 6×7, 7×7, 8×7, etc.

Autumn and I explore multiplying 6×7, 7×7, 8×7, etc. using unit math. Continue reading

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Alice 3 Demonstration

This demonstration is by my (then) 5-year-old daughter Autumn. The software program, Alice, is a great way to help students learn the basics of programming games. Continue reading

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Walking up the stairs little girl

Autumn’s “famous” for being the little girl in the following video used in the Eureka Math/EngageNY Curriculum: Continue reading

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Introducing Cube Knots

Cube knots are a special way to represent a knot in 3-dimensional space. Check out this video that “flies through” a trefoil knot! Continue reading

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Is it okay to write, “1 inch = 13 feet?” to set up a scale factor?

Why is this statement incorrect in setting up a ratio relationship? Hint: the = symbol. Continue reading

Posted in Engineering School Mathematics | 7 Comments

First grade: Is, “3 girls + 2 boys = 3 kids + 2 kids,” a number sentence?

This statement appears to be perfectly okay, but causes problems due to the precise language of mathematics. Continue reading

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Simple example of Textbook School Mathematics.

An example of Textbook School Mathematics. Continue reading

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What is a variable? Part II: Expressions.

We describe expressions in this continuation of Part I. Continue reading

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What is a proportional relationship?

The Common Core State Standards (CCSS) use the term “proportional relationship” throughout the standards. Fortunately, the standards clearly describe what is meant by that term. Continue reading

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What is a variable? Part I: Symbols.

There are three important types of symbols used in mathematics: constant symbols, placeholder symbols, and operator symbols. Which of the three types is a variable? Continue reading

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What is a quantity?

Well….it makes sense that “3 liters” is a quantity, but what is it really? Learn more by reading this post! Continue reading

Posted in Engineering School Mathematics | 5 Comments

Eradicating Textbook School Mathematics (TSM)

It is apropos to begin this blog with a short discussion of Textbook School Mathematics (or TSM). Continue reading

Posted in Commentary, Engineering School Mathematics | 11 Comments

Modeling (24÷3)÷2 = 24÷6

Modeling (24÷3)÷2 = 24÷6 in a way that makes sense to a fifth grader is tricky. Continue reading

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Teaching my 3-year-old to read.

See Autumn learning to read at 3 1/2 years old! (She is now an avid reader at 6.) Continue reading

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Hello world!

An introduction to my Commentary Channel. Continue reading

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