rounding off to significant figures

[shadow oriole]

Middle school math, just wanted to check if it is correct. Thanks in advance!

[whole verge]

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[snow crystal]

When you round, you should discard other figures, except when they constitute the number itself.
So, when you round 3916 with 1 significant digure, you get 4000, but when you round 0.3099, you get 0.3.

If you use the exponential notation for numbers, there's no ambiguity.
For example, if you write 3916 as 3.916*10^3, then after rounding it becomes 4*10^3.

[shadow oriole]

I see

[shadow oriole]

don't understand allat lmao

[snow crystal]

Oh, you haven't learned it yet?

Well, that's fine.

Just follow the first rule that I wrote, then.

[shadow oriole]

I've just started on significant figures today lmao so I will prob learn it in the future unless Singapore education doesn't have it in there

[snow crystal]

Oh, I see. Well, you'll certainly learn the exponential notation, as it's used all over in physics and chemistry.