3-3

Answer: 0

Reason: Subtracting equal numbers yields zero (3 − 3 = 0). Equivalently, 3 − 3 = 3 + (−3) = 0, and in general a − a = 0 for any a.

If you want quick practice:

• 5 − 2 = 3
• 7 − 7 = 0
• −4 − (−4) = 08