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...] about Dr. Cotter on Addition and Subtraction Facts
subtraction
2023 Summer Game #5: 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...] about 2023 Summer Game #5: On the Number Ten
2022 Summer Game #14: Short Chain Subtraction
Did you enjoy last week's game? Happily, 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 … [Read more...] about 2022 Summer Game #14: Short Chain Subtraction
2022 Summer Game #12: Difference of Two Squares
As the summer 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 … [Read more...] about 2022 Summer Game #12: Difference of Two Squares
2021 Summer Game #13: Zero Corners
Summer is such a fun and relaxing time. People are taking vacations, visiting family, enjoying more outside activities, and probably staying up a bit later since the sun is out longer. However, as nice as summer is, at some point "it" hits. What … [Read more...] about 2021 Summer Game #13: Zero Corners
2021 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...] about 2021 Summer Game #12: Ten as the Minuend
