Hi There!
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Question 1:
8 x 10^6 = 8,000,000
4 x 10^2 = 400
Answer: 8 x 10^6 is 20,000 times greater than 4 x 10^2.
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Question 2:
3.6 x 10^9 = 3,600,000,000
1.2 x 10^3 = 1,200
Answer: 3.6 x 10^9 is 3,000,000 times greater than 1.2 x 10^3.
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Hope This Helps :)