Dr. Cotter on Problem Solving

A few years ago while on a shuttle to speak on math at a convention, I started talking to a young man next to me. When he found out I was involved in math, he said he could solve story problems as long as someone told him what operation to use. The … [Read more...]

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 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...]

2018 Summer Game #13: On the Number Ten

It is one of those blazing hot, 90º summer days. No one wants to be outside but without air conditioning, inside isn’t much better. My boys’ solution to this dilemma is the nice, cool basement where the computer happens to reside. In my desire to get … [Read more...]

2018 Summer Game #12: Next Number

The great thing about nephews is that they fill some of the room in your heart and in your schedule after your own boys are grown up and away from the nest. The great thing about math games is that they can be played absolutely anytime, … [Read more...]

2018 Summer Game #11: Robbie’s Bead Trading

My oldest child, Robbie, wants to be a game inventor when he grows up. He’s invented quite a few games, but the majority of them aren’t really math games. They’re heavy on health and damage stats, power-ups, and battles between different cards.... … [Read more...]