In Mathematics at a High School level, learn how to handle significant figures and decimal places in calculations.
Multiplication and Division: The answer should contain the same number of significant figures as the least precise number involved. For example, 1.35 x 2.1 = 2.835 is rounded to 2.8 to match the least number of significant figures (2).
Addition and Subtraction: The result must have the same number of decimal places as the least accurate number in the calculation. For instance, 13.2 + 12.252 = 25.452 is rounded to 25.5 to align with the number with fewer decimal places (1).
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