18.4
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When rounding 18.4 to the nearest tenth, you look at the digit in the hundredths place, which is 4. Since 4 is less than 5, you keep the digit in the tenths place the same. Therefore, 18.4 rounded to the nearest tenth is 18.4.
If you are trying to round 18.4 to the nearest tenth, then you already have your answer there: 18.4
The nearest tenth ends up to be just the first number to the right of the decimal point.
Well, darling, 18.4 rounded to the nearest tenth is 18.4. Why? Because that's already the number to the nearest tenth! No need to change a thing, honey.
Oh, dude, you're really making me do math right now? Fine, fine. 18.4 rounded to the nearest tenth is 18.4. Yeah, I know, mind-blowing stuff. Like, who knew math could be so thrilling?