Question 1: Calculate: 7 - (-3)

Answer: 10

Question 2: Evaluate: -5 - (-8)

Answer: 3

Question 3: Simplify: 12 - 20

Answer: -8

Question 4: Calculate: -15 - (-10)

Answer: -5

Question 5: Evaluate: 3 - 7

Answer: -4

Question 6: A temperature drops from -2°C to -7°C. How much has it decreased?

Answer: 5

Question 7: In a game, a player gains 10 points and then loses 15 points. What is their net score?

Answer: -5

Question 8: Construct a number line to show: -4 - (-6)

Answer: Student draws the correct number line with points at -4, -6, and the resulting position at 2.

Question 9: Plot the point that represents: -8 - 3 on the number line.

Answer: Student plots at -11.

Question 10: Express as a single calculation: (-6) - (-2) + 4

Answer: 0

Question 11: A submarine is at -300 meters deep. It ascends 50 meters, then descends another 100 meters. What is its final depth?

Answer: -350

Question 12: Identify and correct the mistake: 5 - (-3) = 8

Answer: Correct answer is 8; mistake is in thinking the answer is 8 without proper calculation or understanding that subtracting a negative is addition.