Stage: 4 Challenge Level: 
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The triangle OMN has vertices on the axes with whole number
co-ordinates.
Points which have whole number coordinates are called lattice
points.
How many lattice points are there on the hypotenuse MN?
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Real world. Mathematical reasoning & proof. Games. Manipulating algebraic expressions/formulae. Visualising. Generalising. Making and proving conjectures. Common factors. Working systematically. Coordinates - first quadrant.
Published November 1997.
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