Question

If you rewrite the problem 14(22) as 14(20+2) so that you can use mental math, which of the following properties will you use?

Answer 1

For this case, the property you can use is the following:
 Commutative property.
 We have then that:
 14 (20 + 2) = 280 + 28 = 308
 Equivalently:
 14 (2 + 20) = 28 + 280 = 308
 Either way the result is exactly the same.
 Answer: 
 Commutative property.