[header] How to improve your mathematical calculation skills [title] Start easy and take your time. [step] Don't jump straight in there trying to work out what' 235 x 958.7' equals, if you can do that you don't need to read this. Start with easier addition and subtraction questions, even if it is patronizing, make sure you can do them quickly. 
[title] Learn the multiplication tables and find the patterns in them. [step] Knowing the patterns will make multiplication and division of larger numbers much simpler.