(3.8+12.5)× =× ×8
(4.5×3.2)×=3.2×(×4) 3.2×2.5×12.5=×12.5×
0.18÷0.09 0.18×0.09 0.7×0.70.7+0.7
3.07×0.650.307×6.5 4.35×100.8×43.5
3.5×0.2= 10÷0.5= 6×0.25= 0.63÷0.9=
1.8×0.4= 0.99÷0.01= 1.2×4= 3.9×0.01=