资料简介
www.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.com24dm=()m1450g=()kg6km350m=()km8t40kg=()t2.41.456.358.04说一说你是怎么想的。探索新知二
www.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.com把上面的数据改成用厘米作单位的数。0.95m=()cm请你按照高矮顺序,给下面的小朋友排排队。80cm1m45cm1.32m0.95m2探索新知二
www.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.com0.95m=()cm你喜欢哪种方法?你是怎样想的?95探索新知二
www.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.com想一想:1.32m=()cm方法一:1m=100cm1.32×100=132(cm)方法二:1.32m=1m32cm1×100+32=100+32=132(cm)你是怎样想的?用你喜欢的方法算一算。132探索新知二
www.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.com1m45cm>1.32m>0.95m>80cm请你按照高矮顺序,给下面的小朋友排排队。80cm1m45cm1.32m0.95m你们现在能按照高矮顺序给他们排队了吗?探索新知二
www.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.com×进率低高把高级单位的数改成低级单位的数。这两种方法有什么相同的地方?怎样把高级单位的数改成低级单位的数?探索新知二
www.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.com小结:虽然我们采用了不同的方法统一单位,但是最后比较的结果是一样的。×进率低高÷进率把低级单位的数改成高级单位的数,要除以进率,把高级单位的数改成低级单位的数,要乘进率。问题:怎样进行单位间的换算?探索新知二
1.0.3kg=()g0.86m2=()dm22.63km=()m3.7t=()kg3008626303700说一说你的想法。巩固练习三教材做一做翼
(1)你能把它们按照体重由大到小排排队吗?(2)你还能提出其他数学问题并解答吗?1.35t>0.75t>0.35t>228kg>35kg先统一单位228kg=0.228t35kg=0.035t2.巩固练习三教材做一做翼
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