Wearne, Diana and James Hiebert

Research into Practice: Place Value and Addition and Subtraction
Arithmetic Teacher

v41 n5 p272-74 Jan 1994

Compares the development of two students' understanding of addition and subtraction. One student's understanding is based on memorized rules and the other's on understanding the concept of place value. Discusses the effects of different goals for instruction and the importance of understanding place value.