Question

A rectangle has a length of 9.00 inches and a width of 4.25 inches. What is the area in square inches? Round to the correct significant digits.

Answer 1

Area = length * breadth
= 9.00 * 4.25
= 38.25

Both 9.00 and 4.25 are correct to 3 significant digits. So, the answer should be correct to three decimal digits as well and hence the answer is 38.3

Just remember:

For adding, use "least accurate place".

For multiplying, use "least number of significant digits".

Answer 2

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