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The only ways to write 2.1 as a whole number change its value and are to:

  1. Multiply it by a multiple of 10, eg 2.1 x 10 = 21
  2. Approximate it by truncating (deleting) the decimal part: 2.1 → 2
  3. Approximate it by rounding it:
    1. To the nearest whole number: 2.1 → 2
    2. To the nearest 3: 2.1 → 3
    3. To the nearest 4: 2.1 → 4
    4. To the nearest 5 or greater: 2.1 → 0

Or to put it another way 2.1 is a decimal number that, in this case, can be represented using fractions (either an improper fraction of 21/10 or a mixed number of 21/10) with whole numbers for the numerator and denominator.

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13y ago

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Q: How do you write 2.1 as a whole number?
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