Question

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activity thinking about positive and negative numbers around you
do this activity together to investigate positive and negative numbers in the real world.
have you ever ridden on a subway? some subway stations are underground, and some are above ground.
in new york city, the deepest subway station is in manhattan. it is 180 ft below street level. the highest subway station is in brooklyn. it is 88 ft above street level.
this means that if you travel on the subway from the station in manhattan to the station in brooklyn, your elevation relative to street level will increase by 268 ft, since - 180 + 268 = 88.
what else extends both below ground and above ground in the world around you?

Explanation:

Consider common structures and natural features. Buildings can have basements (below - ground) and multiple floors above - ground. Trees have roots below ground and trunks/branches above ground.

Answer:

Buildings, trees.