a) 38 + 41 + 117 + 159 + 62 = ( 38 + 62 ) + ( 159 + 41 ) + 117 = 100 + 200 + 117 = 300 + 117 = 417
b) 73 + 86 + 968 + 914 + 3032 = ( 914 + 86 ) + ( 3032 + 968 ) + 73 = 1000 + 4000 + 73 = 5000 + 73 = 5073
c) 341 x 67 + 341 x 16 + 659 x 83 = 341 x ( 67 + 16 ) + 659 x 83 = 28303 + 54679 = 82982
d) 42 x 53 + 47 x 156 + 47 x 114 = 47 x ( 156 + 114 ) + 42 = 12690 + 42 = 12732
38+41+117+159+62 73+86+968+914+3032
=(38+62)+(41+159)+117 =(86+914)+(968+3032)+73
=100+200+117 =1000+4000+73
=300+117 =5000+73
=417 =5073
341.67+341.16+659.83 42.53+47.156+47.114
=341.(67+16)+659.83 =47.(156+114)+42.53
=341.83+659.83 =47.270+2226
=83.(341+659) =12690+2226
=14916
=83.1000
=83000