Last night DS9 had Math homework. I'm pretty sure the answers were fine - I didn't check, but the whole thing was SO messy. His has an agenda to be signed each night for homework, so I simply said that it was his work, and his responsibility. If he wanted to hand it in like that, it was up to him, but that I wasn't about to sign my name. I think making him take responsibility helps. He wasn't happy, but that was enough to motivate him to re-write it.