If the fraction is less than half, round down. If the fraction is half or greater, round up.
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You round to the nearest whole number.
51 IS a whole number and so you do not need to do any estimating!
The sum of two fractions will only be a whole number if the fractions have a common denominator. When the denominators are different, the sum will be a fraction with a different denominator, making it impossible to be a whole number. Thus, estimating the sum of two fractions will generally result in a fraction, not a whole number.
Some people find it easier to add or subtract whole numbers but yes, you could round to the nearest half.
round to the nearest whole # after estimating the square root