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...]

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 #10: Short Chain Subtraction

There are many variations of the chain games and our family has played most of them as solitaire games. Nicholas, Chiara, and Ian played Short Chain Subtraction today, game S18 in the Math Card Games book, and had a great time! This variation is a … [Read more...]

2018 Summer Game #9: Difference of Two Squares

As the temperature rises, you may be looking for a non-competitive game. The Difference of Two Squares, game P35 in the Math Card Games book, hits the spot. It's like a puzzle that two people work on together. You will need 20 basic number cards. … [Read more...]

2017 Summer Game #13: Zero Corners

It usually starts around April if you follow a traditional school year, an excitement that school is winding down and soon to come to an end. Then before you know it, another school year done. Whew! It’s summertime! Now, I do have my children … [Read more...]

2017 Summer Game #12: Ten as the Minuend

When I started using RightStart Math, I would play many of the games suggested, but my family had our favorites. We would play the same games – or variations of them – over and over, quite content to not explore the unknown games in the Math Card … [Read more...]