四年级数学上册第1单元《大数的认识》亿以内数的认识课件新人教版.ppt

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1、亿以内数的认识,我们班最高的同学身高为 厘米。,爸爸买了一台手提电脑,价格是7008元。,皮衣打折后的价格为2161元。,中国国家图书馆累计藏书约21610000册。,地球半径约为6401000米。,山东省人口总数为90793100人。,150,我们班最高的同学身高为150厘米。,爸爸买了一台手提电脑,价格是7008元。,皮衣打折后的价格为2161元。,中国国家图书馆累计藏书约21610000册。,地球半径约为6401000米。,山东省人口总数为90793100人。,我们班最高的同学身高为 厘米。,爸爸买了一台手提电脑,价格是 元。,皮衣打折后的价格为 元。,中国国家图书馆累计藏书约 册。,

2、地球半径约为 米。,山东省人口总数为 人。,150,7008,2161,21610000,6401000,90793100,数位,十,百,十 万,百万,千 万,亿,个,千,万,十,百,十 万,百万,千 万,亿,个,千,万,十,百,十 万,百万,千 万,亿,个,千,万,十,百,十 万,百万,千 万,亿,个,千,万,十万十万地数,从九百 六十万数到一千万。,15070082161 216100006401000 90093100,数位,数级,个 级,万 级,亿 级,2 1 6 1 0 0 0 06 4 0 1 0 0 0 9 0 0 9 3 1 0 0,1、先读万级,,再读个级。,1、先读万级,,

3、再读个级。,2、万级的数,要按照个级的数的读法来读,再在后面加上一个“万”字;,3、每级末尾不管有几个零,都不读,,其他数位有一个0或连续几个0,都只读一个“零”.,亿以内数的读法,想一想,读一读,8124812485000500 9800003 6060606,文一街小学图书室累计藏书约30050册。中山大学图书馆累计藏书约4086000册。邵逸夫向四川地震灾区捐款100000000港元。,读出下列各数,生活中的大数,2009年全国有10200000名学生参加高考。,到2036年前后,浙江省人口老龄化进入高峰 期,老年人口将达到14750000人,占总人口的31%以上,即3个人中就有一位老年人。,正常人的心脏一年要跳42000000次。,地球赤道周长40075700米。,我的新知识,挑战,

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