Adding and Subtracting Negative Numbers

Adding and Subtracting Negative Numbers

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The picture shows the water level at a reservoir. On January 30, the water level was 2 meters above the ground level.

From January 30 to February 28, the water level increased by 1 meter. Find the water level on February 28.

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The picture shows the water level at a reservoir. On January 30, the water level was 2 meters above the ground level and on February 28th, the water level was 3 meters above ground level.

From February 28 to March 31, the water level decreased by 4 meters. Find the water level on March 31.

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The picture shows the water level at a reservoir. On January 30, the water level was 2 meters above the ground level and on March 31, the water level was 1 meter below ground level.

From March 31 to April 30, the water level increased by 4 meters. Find the water level on April 30.

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At 1900 one winter night, the temperature in Chicago, Illinois, was  $-2\degree C$ .  Between 1900 and 2000, the temperature decreased by  $3\degree C$ .  What was the temperature at 2000?

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At 0800 one winter morning, the temperature in Detroit, Michigan, was  $-2\degree C$ .  Between 0800 and 0900, the temperature increased by  $3\degree C$ .  What was the temperature at 0900?

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Find the value of 10 + q when q = -15.

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The table shows the temperatures of two towns at 11 p.m. on a certain day.

Find the difference between the temperatures.

(-2) - (-5) =

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Find the distance AB.

Distance AB = 8 cm - 1 cm

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Find the distance CD.

Distance CD = (-1 cm) - (-5 cm)

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Find the distance EF.

Distance EF = (3 cm) - (-2 cm)

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Evaluate.

2 + (-10)

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Evaluate.

-4 + (-5)

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Evaluate.

4 - (-7)

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Evaluate.

(-7) - (-3)

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Evaluate.

(-7) + 5

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Evaluate.

(-4) - 7

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Find the value of x - y when x = -4 and y = 1.

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Find the value of x - y when x = -4 and y = -1.

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Find the value of x - y when x = 1 and y = 4.

Open Ended

Eric thinks that (-3) - (-5) is equal to -8.

Explain why Eric is wrong.