Mathematics Resources - Maths B
Integration introduction
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activity pages

problems sheet - finding areas bounded by curves

intuitively understanding the integral - Maths Online
relationship between the graph of a function and the graph of the area function

function/derivative/integral - Cut the Knot
Drag the graph and see the effect on the derivative and integral.

area/integral - R.F.Barrow
Choose a linear, quadratic or cubic function, drag the lower and upper limits and see the area and definite integral.

graphic integral
Match the graph of a function to a graph of an anti-derivative.

left, midpoint and trapezoid rules - Joseph Zachary
The accuracy of the different methods is demonstrated graphically for several functions.

left, right, midpoint, trapezoid and Simpson's rules
only one example but excellent graphics

Numerical integration - Finite Math & Calculus

resources page - calculus (includes calculators/tools)

calculators

  f(x) = 
  f(x) = 
  of 
for  from  to