abrgcolu9p5hapad abrgcolu9p5hapad 17-01-2017 Mathematics contestada Estimate the value of the expression by first rounding each number to the nearest ten thousand. 345,023 + 193,968 A. about 550,000 B. about 539,000 C. about 540,000 D. about 544,000 Will upvote right answer and send tips