Hello and thank you for writing to JustAsk!
Homework comes at the end of a very busy day for most students. Therefore, to help with homework time try to make sure that your child has had a nutritious snack, a bit of rest time and some structure (such as working without distractions, such as television, etc.)
This link by Dr. Lynne Kenney, the Family Coach, may also prove helpful:
http://www.lynnekenney.com/back-to-school-printables-and-postables/
Students often don't understand the purpose of homework, so try and relate their assignments to real life experiences, such as math helps with possibly being a future entrepreneur!
You don't say the age of your child, but regardless if homework is difficult, upsetting or not correct, please consult with the teacher(s).
Good luck!
Louise Sattler