I know it has been around (I learned it from my math coach who got it from another teacher in the district) but I couldn't find an originator. I like it so much more than the other methods because they can go forward or backward in time with it. Some of my kids will only know "subtraction" from third grade, and that really gets confusing when we move to harder problems!
I know it has been around (I learned it from my math coach who got it from another teacher in the district) but I couldn't find an originator. I like it so much more than the other methods because they can go forward or backward in time with it. Some of my kids will only know "subtraction" from third grade, and that really gets confusing when we move to harder problems!