4. Round off to 3 significant figures
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To round off it to 3 significant digits, we required to round it off to 1 place after the decimal. Therefore, 53.214 = 53.2 rounded off to 3 significant figures. [The digit in hundredths place is 1 which is less than 5. So, the digit in the tenths place remains 2 and the digits 1 and 4 disappear.]
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