I know a lot of Mumsnetters find helping their DCs with maths homework a pain. DD works for a numeracy charity, and a lot of parents use their free online resources to get familiar with the sort of maths that their children are now doing. So posting it here ahead of the summer holidays and hoping that it cheers some of you up 
www.nnchallenge.org.uk/home/index.html
The "checkup" might seem long, but you can leave it and come back to it at any time.