Answers Pre-Algebra - MA3119 A Distance LearningAdding Integers

6.3D Subtracting Integers Answers

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Sean says that to add a number to –100 and still have –100 is to add zero. Candice says that she can add two numbers to –100 and still have –100. Who is correct and why?

Sean is correct because adding any numbers other than zero will result in a different number.

Candice is correct because if the two numbers total 100, then the sum will be –100.

They are both correct because adding two numbers that are opposites is equivalent to adding zero.

Neither is correct because adding any number to –100 will result in a different number.

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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?

Ahmed started 6 floors above ground level, then he went down 8 floors.

Ahmed started 6 floors above ground level, then he went up 8 floors.

Ahmed started 6 floors below ground level, then he went up 8 floors.

Ahmed started 6 floors below ground level, then he went down 8 floors.

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.

Which expression has the same sum as the one below?

15 + 6

Negative 6 + (negative 15)

15 + (negative 6)

6 + (negative 15)

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?

Morena started at 15 feet below sea level, then dove down 6 more feet.

Morena started at 15 feet above sea level, then dove down 6 more feet.

Morena started at sea level, dove down 15 feet, then dove down 6 more feet.

Morena started at sea level, dove down 15 feet, then rose up 6 feet.

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

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 ?

–4

–3

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.

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?