《游三峡 小数除法》ppt复习课件.pptx

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7、9ask.comzjkbdf.999ask.comtldxyjy.999ask.comsybdf.999ask.comsqdx.999ask.comhzfkzkyy.999ask.com一、整体回顾小数乘法小数乘小数小数乘整数积的近似数小数乘法的简便计算小数除法小数除以小数小数除以整数商的近似值循环小数小数四则混合运算小数乘除法转化整数乘除法买4.8千克大白菜需要多少钱？1.12×4.81.12×4.8896448≈5.38(元）计算小数乘法时，可以先按整数乘法来算，再根据因数的小数位数确定积的小

8、数位数。精确到“分”二、系统梳理53765.376四舍五入保留积的近似数≈5.38小数乘法：买2.4千克黄瓜需要多少钱？2.6×2.4=×2.62.4104526246.24（元）答：买2.4千克黄瓜需要6.24元。试一试小数乘法：二、系统梳理用简便方法计算下面各题。0.6×2.5×0.5×4=（0.6×0.5）×（2.5×4）=0.3×10=33.5×2.34＋3.5×7.66=3.5×（2.34＋7.66）=3.5×10=35整数的运算律同样适用于小数。小数乘法简便运算：试一试