DS school uses TERC, Everyday Math. He is completely unengaged by it and it is so terribly slow moving. They only got to multiplication (or should I say, multiplication concepts?) in March and have not yet covered long division. School ends 6/26 so I guess they won't be learning it this year.
The worst for him, with handwriting issues, is when he has to write a sentence explaining how he got his answer and why it worked, for such simple concepts that seem far too obvious to write about. A typical answer: "I got four. Because you needed to add two and two." So enlightening!
