Multiple choice general knowledge Which of the following paper sizes is the largest? A2 A3 A4 A5 Reveal answer Fill a bubble to check yourself A Correct answer Explanation In the ISO 216 paper size standard, A2 is the largest among the options given. The A-series follows a pattern where each smaller size is half the area of the previous one: A2 > A3 > A4 > A5. A2 measures 420 x 594 mm.