Round them off. If the fraction is less than 1/2 (the numerator is less than half of the denominator), eliminate it. If the fraction is equal to or greater than 1/2 (the numerator is equal to or greater than half the denominator), increase the whole number by one and eliminate the fraction.
The estimated sum of 2 and 1/3 + 3 and 3/4 is 6.
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