I Teaching children to add and subtract
Teaching children to add and subtract
Gutstein, E.; Romberg, T.A.
II Preparing all students for success in algebra
The vertical hand span: Nonstandard units, expressions, and symbols in the classroom
Godfrey, L.; O'Connor, M.C.
III building on children's thinking
Bridging second-grade children's thinking and mathematical recording
Gill, A.J.; Thompson, A.