100 Square - a really useful tool that can be used for addition, subtraction, multiplication and division.
Above are some example questions that you can ask your children when you are doing normal activities at home or out and about. Try to slip the questions into normal conversation so that the child does not feel as if they are being tested! These are general questions and should be adapted according to your child's age, ability and interest. If your child is finding some questions difficult then perhaps rephrase them to see if this helps, if not then try something easier. If the child is finding them easy then try making them a little harder to stretch their thinking!
Remember to try to make this fun and not a chore...