40× 40 ÷ 72÷ 72×
×= 0.36×= ÷18= ÷=
×1.5= 2.7÷= 0×+= ×3÷×3=
24.06+0.4= += 5﹣+= 2.5×44=
15÷1%= 2.4×= 4×÷4×= 30÷62.5%=