My child in grade 3 often needs a reminder because in a task where he needs to do addition he would subtract instead of adding or v.v ignoring the signs given in a task. He would also forget adding carry.
Why this happens and what can be done to ensure that he does not commit this mistake in future?
He understands the procedure as well as concept but he often commits this silly mistake. What kind of task should be given to him so that he keeps the sign in mind before and during solving the task?