Secondly, you need to find out the reasons for your child's low grades. Is it because I really can't understand the problem and can't think of a solution? Or because of carelessness, such as addition, subtraction, multiplication and division? If not, you need to take the time to explain it clearly to your child and try to make it clear to your child in an easy-to-understand way. Then do exercises. Do more questions if you are careless.
If the child usually conflicts with the purpose of doing the problem, then you can give appropriate rewards, insist on doing the problem, and there will be rewards for doing it right every day. Or spend more time with your child and explain the stakes to her. At this age, your child has learned some truth.
Finally, I wish you a pleasant conversation with your child.