TY - GEN TI - Word problems with addition and subtraction, Jeff's group, Clip 1 of 3: Introduction and problem 1, how many more legos does David have than John? DO - https://doi.org/doi:10.7282/T3X0650T AU - Marinaro, Angela PY - 1989-03-21 KW - Sample of human subjects KW - Mathematics education KW - Learning, Psychology of--Case studies KW - Critical thinking in children--New Jersey--Case studies KW - PreK-2 KW - Number and operations KW - Problem solving KW - Reasoning and proof KW - Communication KW - Connections KW - Representation KW - 1 KW - Classroom KW - Public school KW - Mixed KW - Mixed KW - Manipulatives (Education)--Case studies KW - Student view KW - Word problems with addition and subtraction KW - Unifix cubes KW - Colored stones KW - Direct reasoning KW - Guessing and checking KW - Physical models KW - Arithmetic ER -