GMAT Quantitative Reasoning – Math Questions and Correct Solutions

a + b = - b + a a x b = - b x a (a + b) + c = - a + (b + a) (a x b) x c = - a x (b x a) a (b + c) = - ab + ac Adding a positive number - Move right along the number line Subtracting a positive number - Move left along the number line Adding a negative number - Move left along the number line a + (-b) = a - b Subtracting a negative number - Move right along the number line a - (-b) = a + b 1/2 - 0.5 1/3 - 0.333 1/4 - 0.25 1/5 - 0.2 1/6 - 0.1666... 1/7 - 0.14 1/8 - 0.125 1/9 - 0.11 n = - n/1 n/0 - undefined n/n - 1 1/a/b - b/a a/b x b/a = - 1 bigger numerator - bigger value smaller numerator - smaller value bigger denominator - smaller value smaller denominator - bigger value fraction approaches 1 - increase numerator and denominator by same amount abc/def = - a/d + b/e x c/f a + b/c = - a/c + b/c a/b x b = - a a/b = c/d - ad = bc