New ICMI Study Series ISBN: 9783319635545 Building the Foundation: Whole Numbers in the Primary Grades The 23rd ICMI Study Building the Foundation: Whole Numbers in the Primary Grades Building the Foundation: Whole Numbers in the Primary Grades, Springer International Publishing, pp.91-124, 2018, New ICMI Study Series, ⟨10.1007/978-3-319-63555-2_5⟩