Supplementary Angles or Adding Angles

Directions: Using the digits 0 to 9 at most one time each, place a digit in each box to make a true statement about these angles that add up to a straight angle. *Note: drawing not to scale.


What do you know about acute angles? How might the number of boxes for the addends tell us?


Ex: 42 + 138, 57 + 123, 48 + 132, many possible answers – consider having students have a more approximate angle measure after finding a solution

Source: Catherine Castillo

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