Question

Perform the following calculations, then round off each answer to the proper number of significant figures: 1210.0 g + 157.22 g - 30. g
(Please show work)

Answer 1

Answer:- 1337 g

Solution:- For mathematical operations we use PEMDAS. P stands for parenthesis off, E stands for exponents, M stands for multiplication, D stands for division, A stands for addition and S stands for subtraction. All the mathematical operations are done in this sequence.

What we have given in the problem is, 1210.0 g + 157.22 g - 30. g

Here we have addition and subtraction. As per the law, we will do addition first. In addition and subtraction we go with least number of decimal places.

1210.0 has one decimal place where as 157.22 has two decimal places, since the first number has least decimal places(one decimal place), the answer should also have only one decimal place.

1210.0 g + 157.22 g = 1367.2 g

Now, we will do subtraction. 30. does not have any decimal place and so on subtraction the final answer must not have any decimal places.

1367.2 g - 30. g = 1337 g

So, the final answer is 1337 g.