2002 Children Concept of Addition

1999 Mental Calculation Strategies for Addition and Subtraction

2003 Teaching and Learning Number Sense –

Understanding human brain fom Islam

1999 the Role of Operation Sense in Transitions From

1999 a Contextual Investigation Three Digit Add-subtr

2005 Supporting Teachers in the Development of Young Children Mathematical Thinking

1986 Understanding of Number Concepts in Low

2004 Inquiry Into Children’s Mathematical Thinking