standard_description: Apply and extend previous understandings of addition and subtraction to add and subtract rational numbers; represent addition and subtraction on a horizontal or vertical number line diagram.
problem_activity: Task
The figure below gives the depth of the water at Montauk
Point, New York, for a day in November.
[IMG]
How many high tides took place on this day?
How many low tides took place on this day?
How much time elapsed in between high tides?


aligns: no