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First, eliminate answer choices 91.99 and 91.90 as these answer choices are not rounded to the nearest tenth. To round 91.9998 to the nearest tenth, you need to look at the digit in the hundredths place. The digit is 9. Rounding tells you that if the digit is 5 or greater, round up. Thus, you need to round the digit in the tenths place from 9 up to 10, making 91.9998 go to 92.0.