4) 1.5 × 10 + 2.08 × 45 = 15 + 93.6 = 108.6;

5) 12.08 × 100 - 75.6 × 11 = 1208 - 831.6 = 376.4

6) 46.131 × 10 + 91.05 × 100 = 451.31 + 9105 =  9556.31

4) 1,5*10+2,08*45

   1,5*10=15

   2,08*45=93,6

   15+93,6=108,6

5)12,08*100-75,6*11

   12,08*100=1208

   75,6*11=831,6

   1208-831,6=376,4

6)46,131*10+91,05*100

  46,131*10=461,31

   91,05*100=9105

  461,31+9105=9566,31