Question

use the references to access important values if needed for this question.
when 97.1 is added to 70.724, the result should be reported with \square digit(s) after the decimal point.
when 20.90 is subtracted from 41.1, the result should be reported with \square digit(s) after the decimal point.
when 97.1 is multiplied by 70.724, the answer should be reported to \square significant digit(s).
when 41.1 is divided by 20.90, the answer should be reported to \square significant digit(s).

Explanation:

First Sub - Question: Addition of 97.1 and 70.724

Step1: Recall rule for addition (decimal places)

In addition, the result should have the same number of decimal places as the number with the least decimal places. 97.1 has 1 decimal place, 70.724 has 3 decimal places.

Step2: Determine decimal places

Since 97.1 has the least number of decimal places (1), the sum will be reported with 1 decimal place.

Step1: Recall rule for subtraction (decimal places)

In subtraction, the result should have the same number of decimal places as the number with the least decimal places. 41.1 has 1 decimal place, 20.90 has 2 decimal places.

Step2: Determine decimal places

Since 41.1 has the least number of decimal places (1), the difference will be reported with 1 decimal place.

Step1: Recall rule for multiplication (significant figures)

In multiplication, the result should have the same number of significant figures as the number with the least significant figures. 97.1 has 3 significant figures, 70.724 has 5 significant figures.

Step2: Determine significant figures

Since 97.1 has the least number of significant figures (3), the product will be reported to 3 significant figures.

Answer:

1

Second Sub - Question: Subtraction of 20.90 from 41.1