The Position of the Unknown Set and Children's Solutions of Verbal Arithmetic Problems

The Psychology of Learning Mathematics: Expanded American Edition

1986 • 868 citations

Problem Structure and First-Grade Children's Initial Solution Processes for Simple Addition and Subtraction Problems

1981 • 147 citations

Children's solution processes in arithmetic word problems.

1974 • 44 citations

The Addition Methods of First- and Second-Grade Children

1981 • 42 citations

Incorrect Procedures Used by Primary Grade Pupils in Solving Open Addition and Subtraction Sentences

1980 • 34 citations

Subtraction and the solution of open sentence problems

1973 • 33 citations

Three determinants of difficulty in verbal arithmetic problems

1976 • 29 citations

Problem length as a structural variable in verbal arithmetic problems

1973 • 29 citations