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Dr. Cotter on Addition and Subtraction Facts

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 be efficient in adding, we start with the sums of numbers 1 + 1 through 9 + 9. These are best ... Read More

Dr. Cotter on Place Value

Place value seems to be a difficult concept for many children and even adults. Western children traditionally are taught to add by counting. Counting ignores place value. For children, thinking in terms of tens and ones becomes an unnecessary burden ... Read More

Dr. Cotter on Counting

Most people think of counting as the foundation of math. So we teach kids to memorize the long string of 100 counting words. Next, to count objects, we teach them to touch each block in turn while saying the next word in the string. After completing ... Read More

RS1 Level G, Lesson 121

We've had a few calls about Lesson 121, Fibonacci Numbers and Phi, from Level G. This is a hard one, but, oh, what fun when you get it! So, rather than type a long winded explanation and have you read it, I decided to make a video for you. ... Read More

2017 Summer Games

It is almost summertime. And for many of you, it’s either the end of school or very close to the end. Whoo-hoo! Happy dance! After twenty-three years of homeschooling, I still get excited for summer. About seven years ago, we started schooling ... Read More

12 Square Inches vs 12 Inches Squared

In RS2 Level C, Lesson 109, the child is introduced to measuring area. After a problem of square inches is discussed, the lesson shows the child how to write 12 square inches: 12 in². Then, there's an explanation on the side that reads: Be sure to ... Read More