3.7+5.6= 2.4÷0.08= += 8﹣= 0.23=
×6.4= ×= 3÷1%= 4a+a= 6×÷6×=
4800÷240= 25×12= 16.5÷10%= + =
1- + = 0.3²= 1.02-0.43= 14÷ =
× = ×2÷ ×2=