Of pla how to use mental math to solve. - c: ​56,984 d: 79,473 - the difference in weights is ______ pounds. the difference in weights is given by the expression _______ - _______. compensation can be used to rewrite this so that the second number is the next greater multiple of​ 1,000. doing this gives the new expression ______ - ______. the value of this new expression is _____________. ​(type whole​ numbers.)