Mathematics Study and teaching (Primary) Study and teaching (Elementary) 64 Arithmetic 49 Manipulatives (Education) 42 Study and teaching (Early childhood) 13 Teaching 13 Activity programs 11 Aids and devices 10 Educational technology 8 Study and teaching 7 Education, Primary 5 Education 4 Audio-visual aids 3 Communication in education 3 Feedback (Psychology) 3 Mathematical ability 3 Methods 3 Numeracy 3 Observation (Educational method) 3 Research 3 Computer-assisted instruction 2 Curricula 2 Data processing 2 Educational tests and measurements 2 English language 2 Lesson planning 2 Parent participation 2 Problem solving 2 Reading (Primary) 2