Do the following problems without your calculator, using the properties of addition to help you.

**Problem : **
46 + 78 + 54 =
?

**Problem : **
(56 + 7) + 13 =
?

**Problem : **
67 + 11 + 21 + 68 =
?

**Problem : **
(52 + 85) + (5 + 3) =
?

**Problem : **
34 + 0 + 54 + 26 + 18 + 6 =
?

Which properties of addition (Associative, Commutative, Identity) are used in the following?

**Problem : **
(5 + 64) + 6 = 5 + (64 + 6)

**Problem : **
(5 + 64) + 6 = (64 + 5) + 6

**Problem : **
117 + 0 + 65 = 117 + 65

**Problem : **
54 + 2 + 7 + 1 = 1 + 2 + 7 + 54

**Problem : **
2 + (3 + 4) + 5 = (2 + 3) + (4 + 5)