I question the value of homework, particularly at the primary level, and I am not alone. While I highly recommend reading the book The Homework Myth by Alfie Kohn if you are really interested in this topic, here are some great articles and blogs to get you started.
Opting Out of Homework (a template of a letter parents can give to their child’s teacher)
Homework: It Fails our Students and Undermines American Education (can apply to Canadian education)
Homework Stinks (a four-part series)