norme (1) science (1) inversion (1) calcul (1) Children (1) Pictorial works (1) Will (1) Vice (1) Subtraction (1) Science (1) Pictures (1) Performance (1) Learning disabilities (1) Impact (1) Cognition (1) Children (1) Child care (1) Arithmetic (1) Addition (1) Ability (1) Will (1) Use (1) Science (1) Behavior (1) Performance (1) arithmétique (1)