Crazy Zebra has created 3 activities that work wonderfully as homework. All three activities cover multiplication. On each page, there are four boxes with four different multiplication problems worked out. Three of the boxes have incorrect answers making only one box correct. It is the job of the student to not only find which box has the correct answer, but to also write why the other boxes are incorrect. They are not allowed to simply say "because it's the wrong answer". This is a great opportunity to see which students truly understand how multiplication works as well as incorporate that much needed writing into the math curriculum. The activities cover 3 by 1 multiplication, 2 by 2 multiplication, and 3 by 2 multiplication. I hope your students enjoy these as much as mine.
I will be happy to make others for you if you enjoy them. Let me know what you are needing.