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It took an earthquake to convince one city to do away with a double-decker highway. City planners in San Francisco had tried for years to get approval for removing the Embarcadero Freeway that blocked ...

Subtraction is taking away one number from another. Lilly has 4 balloons, but then one flys away. How many does she have left? You can use subtraction to find the answer. First there were 4 balloons.