420.0
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420 rounded to the nearest tenth is 420.0. This is because the digit in the tenths place is 0, and when rounding to the nearest tenth, we look at the digit in the hundredths place. Since the hundredths place digit is 0, we do not need to round up.
Ah, let's take a moment to appreciate the number 420. When we round it to the nearest tenth, it becomes 420.0. Just a small adjustment, like adding a happy little tree to a painting, to make it even more precise and beautiful.