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Learn about rational numbers and the addition of fractions by exploring the number line.
Move your mouse to lead the sprite along the parallel number lines to the highlighted
fraction. Find the common denominator and reduce the final answer to score.
It's trickier than it looks: you can only move up and down from one number line to the
next where there are equivalent rational numbers.
Requires installation of
Java version 1.4 or above.
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