Question

if a =4.2 ×10-5 and b =3.5×10-6 then find a+b, a-b and a×b corrected to significant figures
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Answer 1

Explanation:

Rules for significant figures:

Addition and subtraction:

The resultant should retain the least number of decimal places in the numbers added or subtracted

Multiplication and division:

The resultant should retain the least number of significant figures of the numbers multiplied or divided