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21.9
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When rounding 21.90 to the nearest tenth, you look at the hundredths place, which is zero in this case. Since zero is less than 5, the tenths place remains the same. Therefore, 21.90 rounded to the nearest tenth is 21.9.
Oh, dude, you're hitting me with the math questions! Alright, so 21.90 rounded to the nearest tenth is 21.9. Yep, just chop off that zero at the end and you're good to go. Math can be chill, right?
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