Dr. Cotter on Addition and Subtraction Facts
December 27, 2023
Addition Addition can be thought of as finding the whole when the parts are known. Place value greatly simplifies finding the sum of two numbers. To
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Dr. Cotter on Measurements
December 19, 2023
Measurement is an application of math that is an important part of everyday life. We measure length, area, volume, mass (weight), temperature, time,
Dr. Cotter on Manipulatives
December 11, 2023
When teaching math to a child, there are three important questions to consider: Are manipulatives necessary for teaching math? What is the purpose of
Dr. Cotter on Place Value
November 28, 2023
Place value is the very foundation of arithmetic. Place value packages numbers into groups of tens and tens of tens. This makes calculating large
Dr. Cotter on Multiplication
November 21, 2023
Multiplication has been the mathematical downfall of many children (and adults!). It’s not so much the problem of the algorithms, but rather it’s the
Dr. Cotter on Counting
November 14, 2023
Most people think of counting as the foundation of math; therefore, they teach kids to memorize the long string of 100 counting words. Next,
Dr. Cotter on Symmetry
November 7, 2023
Dr. Cotter has an article published in the Hungarian journal Symmetry: Culture and Science, Volume 34, Number 3! Her article is titled Symmetry for Children Using
RS2 Level H, Lesson 91
September 15, 2023
RS2 Level H, Lesson 91 September 15, 2023 by Kathleen Cotter Clayton Susan wrote us: “Hello, my son and I are struggling with Lesson 91, with problems
RS2 Level H, Lesson 82
September 14, 2023
RS2 Level H, Lesson 82 September 14, 2023 by Kathleen Cotter Clayton Today’s blog is thanks to Joanna and her son, Hunter. They live in Florida and started with
RS2 Level H, Lessons 45, 46, and 47
September 13, 2023
The RS2 Level H Lessons 45, 46, and 47 are some of my most favorite lessons. They can be a challenge to grasp, but, oh, what