Also you can print out the big maths beat that worksheet and do those. Whatever the strategy the only important thing is that you practice 10 mins a day or so, EVERY DAY, Christmas and New year included ;)
I second Plyt, we played it a lot, it's fun in that you play as a family and all family members are properly challenged! It goes beyond merely memorising times tables 'facts' (once you have these down pat) to applying them to quickly work out other multiplications e.g. 6x8x5. And children can learn other things as well, e.g. you can model how you deal with a (arithmetic) challenge, and how you deal with getting it wrong etc. You can be a learner alongside your child, rather than you being the one that knows everything (assuming you know your own times tables) and the child the one that needs to learn.
Usborne's 'See Inside Times Tables' is quite nice for starting out, it shows patterns and demonstrates what multiplication actually means, whilst feeling very non-scary.