I will be introducing Int Calc soon (this is an IB HL course) For some reason I don't want to just do 'anti-differentation'. Am I wrong? Is there an easy to follow, 'first principles' approach, that others have used? Eventually (ie in a week or two) I'd really like to explain <u>why</u> the integral between limits gives the area. Easily done? I know this may show me to be an idiot within the Maths Community, but you have always been very helpful in the past.