Four Operations with Positive and Negative Numbers

3 - (-9)

• 12

• -6

• 6

• -12

When you add integers with the same sign...

• you always get a positive

• you always get a negative

• you add and keep the sign

• you subtract and take the sign of the larger number

• you keep, change, change

When you multiply or divide and signs are different, you get a...

• Positive

• Negative

When you add integers with different signs...

• you always get a positive

• you always get a negative

• you add and keep the signs

• you subtract and take the sign of the larger number

• you keep, change, change

A submarine is 150 feet below sea level while an airplane is 375 feet above sea level. What is the difference between the height of the submarine and the airplane?

• 325 feet

• -325 feet

• 525 feet

• -525 feet

A hiker starts at an elevation of 200 feet below sea level and hikes up to an elevation of 150 feet above sea level. What is the total change in elevation?

• 350 feet

• 50 feet

• -350 feet

• -50 feet

Joe is playing a game with a regular die. If the number that turns up is even, he will gain 5 times the number that comes up. If it is odd, he will lose 8 times the number that comes up. He tosses a 3 and a 6. Express the total points Joe gains as an operation of integers.

• 6 x 5 + 3 x (-8)

• 6 x (-8) + 3 x 5

• 6 x 5 - 3 x (-8)

• 6 x 8 - 3 x 5

In a game, losing a round means you owe 5 points. If a player lost 3 rounds and then won a round earning 15 points, what is the player's score?

• 0 points

• 5 points

• -5 points

• 10 points

Last month, Lisa's bank statement said that she had money in her account. Her bank balance was $109.32.

This month, Lisa's bank balance is -$87.12. What does this mean?

• Lisa overdrew her account by $87.12.

• Lisa has $87.12 in her account.