a) 81+243+19 = (81+19)+243 = 100+243 = 343
b) 168+79+132 = (168+132)+79 = 300 + 79 = 379
c) 5.25.2.16.4 = 5.2.25.4.16 = 10.100.16 = 1000.16=16000
d) 32.47.32.53 = 32. ( 47+53) = 32 . 100 = 4200
a ) ( 81 + 19 ) + 243 = 100 + 243 = 343
b ) ( 168 + 132 ) + 79 = 300 + 79 = 379
c ) ( 5 x 2 ) x ( 25 x 4 ) x 16 = 10 x 100 x 16 = 16000
d ) 32 x 47 x 32 x 53 = 1504 x 32 x 53 = 48128 x 53 =2550784
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\(a.81+243+19\) \(b.168+79+132\)
\(=\left(81+19\right)+243\) \(=\left(168+132\right)+79\)
\(=100+243\) \(=300+79\)
\(=343\) \(=379\)
\(c.5.25.2.16.4\) \(d.32.47.32.53\)
\(=\left(5.2\right).\left(25.4\right).16\) \(=1504.32.53\)
\(=10.100.16\) \(=48128.53\)
\(=1000.16\) \(=2550784\)
\(=16000\)