Calculate the answer. Express it in scientific notation. All answers should have the correct number of significant figures. 4.9×10−2⋅9.80×102=?

1 Answer
Junaid Mirza
Jun 13, 2018

4.8×101

Explanation:

⇒(4.9×10−2)×(9.80×102)

⇒4.9×9.80×10−2+2

⇒48.02×100

⇒48.02

⇒4.802×101

The rule says "answer should have same significant figures as the least significant number in the problem." In our problem 4.9 is least significant number with 2 significant figures. Therefore our answer should have 2 significant figures. So,

⇒4.8×101

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