Can 70 over 105 be simplified?
A good way in which to check this out would be to break down both 70 and 105 in terms of their factors:
70 = 2*35 = 2*5*7
105= 5*21 = 5 * 3*7
Notice that the factors 5 and 7 are common to both numerator and denominator.
Thus,
70 2*35
------ = -------------- = 2/3 (answer).
105 3*35