Do your kids understand the work they are doing or do they just sit at the table or desk and stare at their papers when they should be doing homework. I used to send it back marked he does not understand this. I always felt they should help him learn not me. Then I found there was a website online where they had math worksheets and extra help for those from k-12 grades and also for other types and advanced problems there are many recommended websites. Now we all have made a point of brushing up on our mathematical skills and we help each other. I am proud that as a parent I can do the work too.