Add the following in three ways. Indicate the property used.(a) 25 + 36 + 15(b) 30 + 18 + 22

(a) 25 + 36 + 15
Way I: 25 + (36 + 15) = 25 + 51 = 76
Way II: (25 + 36) + 15 = 61 + 15 = 76
Way III: (25 + 15) + 36 = 40 + 36 = 76
Here, we have used associative property.
(b) 30 + 18 + 22
Way I: 30 + (18 + 22) = 30 + 40 = 70
Way II: (30 + 18) + 22 = 48 + 22 = 70
Way III: (30 + 22) + 18 = 52 + 18 = 70
Here, we have used associative property.