9.9×4.950 15.6×2.11.56×21
0.84÷1.20.84 7.53×1.017.53÷1.01
3.7+5.6= 2.4÷0.08= += 8﹣= 0.23=
×6.4= ×= 3÷1%= 4a+a= 6×÷6×=