Open class is the test of teachers' teaching quality and teaching effect by school leaders and subject teaching and research directors. If there is an error in the open class, the results will definitely be affected. First of all, you can see that the teacher is not strict and careful by spelling. And math teachers need to be very careful and rigorous. How much the specific impact will be deducted depends on the indicators of the school's evaluation of teachers' teaching. Deduct points according to the indicators of the school.