Morena, a scuba diver, used the expression below to describe her position in relation to sea level.Which statement could describe the diver’s movements?

Sebastian was in a hotel lobby and took the elevator up 7 floors to his room. Then he took the elevator down 9 floors to the parking garage. He described his movement with the expression below.What is Sebastian’s error?


What is the value of the expression?



Rita is adding . She rewrites the expression as . What is Rita’s error?

Ahmed is riding the elevator in a building. The building has floors above and below ground level. Ahmed uses the expression below to describe his movement.Which statement could describe Ahmed’s movement?

Which sum does the model below represent?





A scuba diver used the expression below to describe his position in relation to sea level.Which statement could describe the diver’s movements?

A meteorologist used the expression below to describe how the temperature changed. Which statement could describe how the temperature changed?

Which expression has the same sum as the one below?





Indira is using a number line to add . She begins by showing –1 on the number line, as shown below.What is the sum of ?

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