Tasks and Activities in the Mathematics Classroom; From Task to Activity: Noticing Affordances, Design, and Orchestration; Affordances of Typical Problems; Mathematical Tasks Enacted by Two Competent Teachers to Facilitate the Learning of Vectors by Grade Ten Students; Use of Comics and Its Adaptation in the Mathematics Classroom; Designing and Implementing Scientific Calculator Tasks and Activities; Engaging the Hearts of Mathematics Learners; Developing Interaction Toward the Goal of the Lesson in a Primary Mathematics Classroom; Designing and Implementing Activities in the Flipped Classroom in the Singapore Primary Mathematics Classroom; Designing Mathematical Modelling Activities for the Primary Mathematics Classroom; Extending Textbook Exercises into Short Open-Ended Tasks for Primary Mathematics Classroom Instruction; Integrating Problem Posing into Mathematical Problem Solving: An Experimental Study; A Vicennial Walk Through 'A' Level Mathematics in Singapore: Reflecting on the Curriculum Leadership Role of the JC Mathematics Teacher; Probability: Theory and Teaching;