Answers Pre-Algebra - MA3119 A Distance LearningAdding Integers

Adding Integers Answers

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Sheila wants to test the reasonableness of her answer to the expression below by using compatible numbers.Which equation would help Sheila do this?

10 + 20 + 10

–10 – 20 + 8

–10 + 20 + 10

10 + 20 – 8

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What is the value of the expression?

Negative 28

Negative 4

Which expression has the same sum as the one below?

15 + 6

Negative 6 + (negative 15)

15 + (negative 6)

6 + (negative 15)

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?

Sebastian should have used –9 and 7.

Sebastian should have started at zero before adding –7.

Sebastian should have switched the two addends and written .

Sebastian should have used 0 and –9.

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

The temperature was –5 degrees, then it increased 4 degrees.

The temperature was –5 degrees, then it decreased 4 degrees.

The temperature was 5 degrees, then it increased 4 degrees.

The temperature was 5 degrees, then it decreased 4 degrees.

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

She used the commutative property, which cannot be used with negative numbers.

In the new expression, –8 and 1 should both be negative.

She used the associative property which should only be used with positive numbers..

She switched the negative signs for –8 and 1.

Which addition does the model below represent?

3 + (negative 1)

3 + 4

3 + (negative 4)

3 + 1

Which sum does the model below represent?

4 + (negative 7) = negative 3

4 + 7 = 11

8 + (negative 3) = 4

11 + (negative 4) = negative 3

Which expression has the same value as the one below?

12 + (negative 9)

Negative 12 + 9

Negative 4 + (negative 9)

4 + (negative 9)

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

Starting on a platform 2 feet above sea level, dive down to a location that is 18 feet below sea level, and then rise 8 feet.

Starting on a platform 2 feet above sea level, dive down to a location that is 20 feet below sea level, and then rise 8 feet.

Starting 2 feet below sea level, dive down 20 more feet, and then rise to a location that is 8 feet below sea level.

Starting 2 feet below sea level, dive down 18 more feet, and then rise to a location that is 8 feet below sea level.

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Adding Integers Answers

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