1.口算 2.6×85=221 0.36×31.2=11.232 12.5×76=950 0.84×6=5.04 0.53×0.8=0.424 62×74.3=4606.6 7.2×6.5=46.8 0.71×0.5=0.355 32.6×35.2=1147.52 5.4×0.8=4.32 0.63×21.8=13.734 2.63×32.4=85.212 8.5×0.7=5.95 6.77×0.03=0.2031 1.24×84=104.16 2.列竖式计算 ①0.74×0.5=0.370 0.74 ×0.5 0.370 ②0.58×0.6=0.348 0.58 ×0.6 0.348 ③0.31×75.2=23.312 75.2 ×0.31 752 2256 23.312 3.递等式计算 ①7.2×31+7.2×69 =7.2×(31+69) =7.2×100 =720 ②3.8×13.5-3.5×3.8 =3.8×(13.5-3.5) =3.8×10 =38 4.应用题 超市苹果每千克8.6元,妈妈买了3.2千克,一共需要付多少钱? 解:8.6×3.2=27.52(元) 答:一共需要付 27.52 元。
