6. Simplify each expression. Identify the property used.
(a) 8 +23+2
(b) 17 + 29 + 3
(d) 33 + 48 + 7
(e) 20 + (63 +80)
(Hint. See Solved Ex. 3]
(c) 16 + 47 + 14
(f) 8 + 13 + 7 + 12
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8+23+2= (8+2)+23 = 10+23 = 33.
17+29+3= (17+3)+29 = 20+29 = 49.
33+48+7= (33+7)+48 = 40+48= 88
20+(63+80)=(80+20)+63 = 100+63=163
16+47+14=(16+14)+47 = 30+47 = 77
8+13+7+12= (8+12)+(13+7) = 20+20= 40
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