Answer:
6x10^5 is bigger
Explanation:
6x10^5 = 6 X 100,000 = 600,000
20x10^4 = 20 X 10,000 = 2 X 10 X 10,000 = 2 X 100,000 = 200,000
600,000 - 200,000 = 400, 000
9.4m questions
12.2m answers