15×60= 640÷40= ÷ = 398÷202≈ 6.9÷0.1=
1.05-0.65= 0.8×125%= 5- = ÷6= 910-430=
526﹣198= 0.32×2.5= n×n= kg:240g=
24×+= 2.6+1.98= -= 1.6÷25%=
÷= ×÷×0=