3cdot 9+11=square 4cdot 8-10=square 16:4+6= 10cdot 3-4=square 28:4+9=square 4cdot 3+7= 6:3+18=square 4cdot 4-12=square 4cdot 6-11=square 30:3+2=square 40:4-8=square 18:2-6= 3cdot 4+13=square 12:4-1=square 4cdot 7-16=square