Question

1Q-solve with due regards to significant figers:13.1+15.18+18.1+21.1
Q2-solve with due regards to significant figure:(3.5×10^-4)+(4.0×10^-7)

Answer 1

Answer:

1)67.5

2)

Explanation:

13.1+15.18+18.1+21.1 = 67.48

but, while addition and substraction, we should write the answer in a way that it should contain the decimal points which is equal to the one with least decimal point in the question..

here, in this question, the one with least decimal point is 13.1,18.1 and 21.1 (three of them have one decimal point), therefore answer should also contain one decimal point..

so, we should round off the last digit, and hence the answer is 67.5 (number should be raised by 1 if the rounding off digit is greater than 5)