7.2×1.8= 0.72×180=
×1.8=1.296 720×=129.6
6.3÷0.7= 0.8÷2= 2.8×9+2.8= 5×5÷5=
6.6÷0.66= 1.5×5= 7.5+2.5×4= 1.25×8÷1=
1.58×6.5= 6.93÷3.3= ☆256.4÷12≈