2- = 4.9× = ÷ = ×10=
× = 3.3× = ×12.5= 1÷ =
100×2.5%= 6.8÷10%= 1-35%= × ÷ × =
①20%x=2.5
②
③+0.6x=1.4
×12= 14÷=
0.5×0.6= 1-= ÷2=
×16= 12÷ = × = 0× + =
1÷ = ÷ = 3.6× = × ÷ × =
3.14×6= 2×3.14×12= + =
0÷20%= 60×30%= 25÷40%=
36× = ÷ = 3× ÷3× =
1800-799= ×0= 354+147≈
10-10%= 3.6 +1.8= ×5.6= 723÷89≈
2÷= 12.3+7 = 0.23= 0.125×17×8=