Question

Perform the followingmathematical operation, andreport the answer to theappropriate number ofsignificant figures.5.4 – 4.21 = [?]=Enter

Answer 1

For addition or subtraction operations, we must first round off the values of significant figures in order to make them to the same number of decimal places:

Let's round 4.21 to 4.2.

Now we do the operation:

5.4 - 4.2 = 1.2

After the calculations, we choose as a reference the number with the fewest decimal places. For subtraction operations, we must follow the same reasoning as for addition.

Answer: 1.2