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Question

Keegan and Jeff did some research and found that there are approximately 7,492,000,000,000,000,000 grains of sand on Earth. Jeff says that it is about $7 \times 10^{15}$ grains of sand. Keegan says that this is about $7 \times 10^{18}$ grains of sand. Whose estimate, Jeff's or Keegan's, is more logical? Explain.

Solution

VerifiedAnswered 2 years ago

Answered 2 years ago

Step 1

1 of 2Keegan's estimate is more $\textbf{logical}$ because we need to count all the numbers after the first, not just how many $0$ we have. Jeff counted only $0$ and ended up with a power of $10$ with $\textbf{lesser exponent}$ than Keegan's.

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