\(18.15+35+15.32+35.4+9\)
\(=\left(18.15+15.32\right)+\left(35+35.4\right)+9\)
\(=\left[15.\left(18+32\right)\right]+\left[35.\left(1+4\right)\right]+9\)
\(=\left[15.50\right]+\left[35.5\right]+9\)
\(=750+175+9\)
\(=934\)
\(18.15+35+15.32+35.4+9\)
\(=15.\left(18+32\right)+35.\left(1+4\right)+9\)
\(=15.50+35.5+9\)
\(=15.50+\left(15+20\right).5+9\)
\(=15.50+15.5+20.5+9\)
\(=15.\left(50+5\right)+100+9\)
\(=15.55+109\)
\(=825+109=934\)
\(18\cdot15+35+15\cdot32+35\cdot4+9\)
\(=15\left(18+32\right)+35\left(1+4\right)+9\)
\(=15\cdot50+35\cdot5+9\)
\(=750+175+9=934\)
