2+2

4

Notes for exam prep:

• Base-10: 2 + 2 = 4
• In base-3: 2 + 2 = 11 (since 4 decimal = 11 in base-3)
• In binary: 10 + 10 = 100 (2 decimal is 10₂, sum is 100₂ = 4)
• In Roman numerals: II + II = IV

Want more practice problems or a quick refresher on addition properties (commutativity, associativity)?