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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

RS2 Level F, Lesson 105

Lesson 105 in RS2 Level F is titled Dividing Fractions on a Fraction Chart. This lesson is very critical to understanding division of fractions. Yes, when dividing fractions we are generally taught to just invert and multiply. But why? Why does this ... Read More

RS1 Level G, Lesson 92

We just had a student email us with questions about Level G, Lesson 92. Well, actually, it was Worksheet 92-2, problem 5. Obviously, we need to see what the problems looks like. Here is the first problem. We are given an object and are to ... Read More

Rachel on Strong Learners

We have recently been hit with lots of snow. I suppose, being winter time, I should expect it. But as I sit and watch the snow fall down (quite quickly, may I add) I am amazed when I consider that no two snowflakes are the same. Here I am – watching ... Read More