Lower Elementary:
Question: Lily has a number of 2-cup jello molds, a number of 3-cup jello molds, and 14 cups of jello. Which size mold should Lily use if she wants all of her jello desserts to be the same size without leaving any jello unused?
Answer: 2-cup molds
Solution: We can count to 14 by 2s (2, 4, 6, 8, 10, 12, 14), but we can’t count to 14 by 3s (3, 6, 9, 12, 15). So, if Lily wants to use all 14 cups of jello, she’ll need to use the 2-cup molds.
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