直接写得数．
7.8+2.2= 27+456+73= 8﹣3.5= 4÷9= 14÷15=
70÷0.5= 3×0.2×0.5= 5÷8= 99÷100= 7.9÷0.1=
估算．
4.83×0.52≈ 5.03×3.98≈ 4.01×8.9≈ 15.2÷2.9≈ 4.83÷0.21≈ 55.8÷3.9≈
口算：
0.3÷0.1= 3.25×4= 15.5+0.45= 23×0.02= 0+2÷4=
302= 0.43= 3.05÷100= 1﹣0.99= 4.5÷3×3=
直接写得数
8.6+4= 0.35÷0.7= 6.5×0.2= 0.7×0.9= 7.2+2.8=
0.96÷0.03= 12×2.5= 8.4÷4.2= 1.4×5= 1.68÷0.3=
3.1×0.03= 27+456+73= 1÷0.25= 7.2×0.3= 0.99+1.8=
1.2÷3= 2.3+1.9= 7.6÷4= 0.3×0.02= 2.87÷0.7=
直接写得数．
0.99+1.8= 1.5×0.4= 0÷4.86= 0.84÷2=
2.5﹣0.05= 0.72÷0.9= 2.4÷0.06= 0.8×1.25=
0.3×0.3= 10×0.07= 0.05×7= 0.2×0.26=