The answer is: - (9/40). ___________________________________________
-2/21 * 27/40 = ? _________________________________ The "-2" cancels to "1" ; and the "40" cancels to "-20" ; since: "40÷ -2 = -20" ; and since: "-2 ÷ -2 = 1".
The "21" cancels to "3" ; and the "27" cancels to "9" ; Since: "21÷3 = 7" ; and since: "27÷3 = 9. ____________________________________________ So, we can rewrite the problem as follows: ____________________________________________
