How many times larger is 2 x 10^10 than 5 x 10^6?

A. 4000

B. 4

C. 400

D. 40

Divide the whole numbers:

2 / 5 = 0.40

When dividing scientific numbers subtract the exponents:

10-6 = 4

Now you have:

0.4 x 10^4

Rewrite to scientific notation:

4 x 10^3

Convert to standard form: 4000

The answer is A.