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You would not round 1.66 to 2.0.

1.66 is a number given to two decimal places (dp). To the nearest 1 dp it would be rounded to 1.7, not to 2.0

And, to 0 decimal places, it would be rounded to 2, not 2.0. Although in most respects, 2 and 2.0 are equivalent, in terms of rounding they are not. 2.0 implies a greater degree of precision.

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Q: How would you round off a value from 1.66 to 2.0?
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