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Position your ruler on U. Which point should you join to in order to get the steepest line possible? The next steepest? And the next?
Now think about where you could fix one end of your ruler and move the other end in order to make all the possible negative gradients.
How Steep Is the Slope?
Age 11 to 14
Challenge Level 
Position your ruler on U. Which point should you join to in order to get the steepest line possible? The next steepest? And the next?
Now think about where you could fix one end of your ruler and move the other end in order to make all the possible negative gradients.
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