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Unusual Property

Identify four different non-zero numbers, a, b, c, and d, so that
a/b + c/d = (a+c) / (b+d)

 Related External Resources

No Matter What Shape Your Fractions are In
A geometric approach to fractions.

Visual Fractions [ java applet ]
A series of java programs using number lines to help visualize fractions and the operations on them.

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