All to Know About Integers

A negative plus a negative is a

• Positive

• Negative

A negative plus a positive

• Negative

• Positive

• It depends on which is the larger number

A negative times a positive

• Positive

• Negative

14 + -6 + 8 =

• 16

• 22

• -16

• 28

-4 - _ = -10

_ - -3 = -5

• -8

• -2

• 8

• 1

In which story is the answer to the question 0?

• A tuna was searching for food in the sea at an elevation of -16 feet. He saw a herring below him and swam down 16 feet in elevation to catch it. At what elevation did the tuna catch the herring?

• A tuna was searching for food in the sea at an elevation of -16 feet. He saw a herring above him and swam up 16 feet in elevation to catch it. At what elevation did the tuna catch the herring?

In which story is the answer to the question 0?

• A sea lion was swimming in the ocean at an elevation of -4 meters. He saw a fish above him and swam up 4 meters to catch it. At what elevation did the sea lion catch the fish?

• A sea lion was swimming in the ocean at an elevation of -4 meters. He saw a fish below him and down 4 meters to catch it. At what elevation did the sea lion catch the fish?

Read this word problem.

The city of Amsterdam is 2 meters below sea level. Lammefjord, a city in Denmark, is 7 meters below sea level. How much higher is Amsterdam than Lammefjord?

To solve the problem, Elizabeth subtracted –2– (–7) and came up with an answer of –5. Is Elizabeth correct? Why or why not?

• Yes, Elizabeth is Correct!!

• No, The answer should have been 5 meters, not -5 meters. Because Amsterdam is higher than Lammefjord.

• No, Elizabeth should have added -2 + (-7) because she needs to find the total difference.

Read this word problem.

In science class, Victor started an experiment using a solution with a temperature of –

5°C. During the experiment, the change in the solution's temperature was –4°C. What was the final temperature of Victor's solution?

To solve the problem, Antonio added –5+(–4) and came up with an answer of –9°C.

Is Antonio correct? Why or why not?

• Yes, Antonio is correct.

• No. The answer should have been 9°C, not –9°C, because a negative plus a negative is always a positive.

• No. Antonio should have subtracted –5 – (–4) because the temperature dropped.