First, find the first non-zero digit, starting from the left.
Then, count however many significant figures you need.
Finally, if the next digit is 4 or less, just stop there. If it is 5 or bigger, increase the last digit by 1 (carrying if needed).
Here are several examples of rounding to two significant figures:
0.432 ≈ 0.43
0.00010345 ≈ 0.00010
0.0877 ≈ 0.088
0.08992 ≈ 0.090
#maths
stone torrent
Not sure where you got that information. For me, several is 3 or more.
Anyway, what did you get for your problem?
No, that's not correct.
Well, let's go step by step.
- We find the first non-zero digit from the left.
0.007249 - We count 2 digits from it, including it.
0.007249 - We look at the next digit. It's 4, which is less than 5, so we remove all the digits after the two we've found and don't change them.
0.0072
And that's the result.