a) $18+52=70$  

$101-47=54$

$27\cdot 3=81$

$4\cdot 125=500$

$270:30=9$

$488:4=122$

b) $2,7\cdot 10=27$  

$100\cdot 8,54=854$

$27,3:10=2,73$

$16,2:100=0,162$

$5,4:100=0,054$

c) $4,7+5,4=10,1$  

$5,5-1,8=3,7$

$4\cdot 1,05=4,2$

$6,2:0,2=31$

$20\cdot 7,5=150$

$2,5\cdot 400=1000$

 

d) $\frac{1}{3}+1\frac{1}{6}=1,5$  

$5\frac{1}{4}-2\frac{3}{4}=2,5$

$\frac{1}{2}+0,75=1,25$

 

${\left(\frac{1}{2}\right)}^3=0,125$

$\frac{2}{5}\cdot \frac{1}{3}=0,1333333$

$1\frac{1}{2}\cdot \frac{1}{2}=0,75$

$1\frac{1}{2}:\frac{1}{2}=3$