Round off the following to one significant figure and simplify
A.9.6 + 5.8 b.817 -19 c.6720 + 24
A. 9.6 + 5.8 = 15.4 = 20
B. 817 - 19 = 798 = 800
I'll leave the last one for you.
I am confuse
To round off a number to one significant figure, you need to look at the digits in the number and consider the first non-zero digit from the left. All the digits after that are considered insignificant and are to be dropped.
Let's go through each calculation:
A. 9.6 + 5.8
To round off to one significant figure, you only consider the first non-zero digit, which is 9.6. Since the second digit, 5, is less than 5, we round down. Therefore, the answer is 9.
B. 817 - 19
Here, the first non-zero digit is 8 and the second digit is 1, which is less than 5. Round down. Therefore, the answer is 800.
C. 6720 + 24
The first non-zero digit is 6, and the second digit is 7, which is greater than 5. In this case, we round up. Therefore, the answer is 6730.
To summarize:
A. 9.6 + 5.8 ≈ 9
B. 817 - 19 ≈ 800
C. 6720 + 24 ≈ 6730