直接写得数1﹣0.95= 0.36+2.4= 8×30%= 2.1÷70%= 9.9+0.1÷0.1=+= ×6%= 12×(+﹣)= 0.25×1.92×0.4= 12π=
估算:12÷2≈ 18÷2≈ 11÷2≈ 26÷3≈
估算:49÷5≈ 50÷2≈ 61÷5≈ 62÷3≈
估算:42÷5≈ 41÷2≈ 47÷5≈ 48÷2≈
估算:39÷5≈ 40÷2≈ 41÷4≈ 42÷5≈
估算:89÷5≈ 87÷2≈ 88÷3≈ 87÷9≈