Everyday Mathematics
Why a triangle’s angles add to 180 degrees on a flat surface
Use a paper triangle to explore the 180-degree angle sum, then connect the observation to a parallel-line argument that explains why it works.
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Everyday Mathematics
Everyday Mathematics
Why a repeating decimal can still be written as a fraction
A repeating decimal can represent an exact fraction. Use a short algebra example to distinguish an endless repeating pattern from a rounded display.