Okay, the first one, for the first unit (Of Go Math.. but can work with any program) is free. You try it out. I am telling you - you're gonna love it. It takes all the bellyaching of homework out. See, I write up all the problems and just tell kids the number of the day, like 2. They do all the problems with that number. If they get it correct, they move on to a harder number, like 25, or 2.5, whatever my kids need. I can differentiate by level: table one gets 2.5 but table two gets 3.5; or if you pass 2.0, you get 2.05. It can be differentiated, collaborative, or independent and uniform, your call for your class.
Look, try to first one.
Make copies for everyone. Try it.
Buy the rest.
Now, another benefit is that each one is as devoid of language as humanly possible. So, I can show non-english speaking parents a model with answers and they can keep it on the fridge. Kids who speak limited English can still succeed, since we all GO Math is pretty damn wordy!
You got nothing to lose... well, except of the headache of having 50 different homework assignments to keep track of!