Final answer:
When performing calculations, carry extra significant figures from step to step and round off only in the final answer to minimize errors. Intermediate rounding can introduce inaccuracies. In the given example, the final answer would be rounded to 72.
Step-by-step explanation:
When performing calculations, it is recommended to carry two extra significant figures from step to step and round off only in the final answer. Rounding intermediate answers can introduce errors. For example, if you were asked to calculate (13.2 + 12.252) x (1.35 x 2.1), you would perform the intermediate calculations to full precision: 25.452 x 2.835 = 72.15642. Then, round the final answer according to the given instructions, which would be 72.