一年級(jí)下冊(cè)數(shù)學(xué)第三單元《做個(gè)百數(shù)表》ppt

做個(gè)百數(shù)表北師大版數(shù)學(xué)一年級(jí)下冊(cè)學(xué)習(xí)目標(biāo):

1、通過(guò)填寫(xiě)百數(shù)表，體會(huì)100以?xún)?nèi)數(shù)的排列順序，以及100以?xún)?nèi)數(shù)的大小。

2、探究百數(shù)表中隱含的規(guī)律，提高探究樂(lè)趣。123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100從上到下看，第三豎行個(gè)位都是幾？從上到下看，相鄰的兩個(gè)數(shù)之間相差10。十位有什么變化？十位數(shù)都+1123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100

從上往下看，最右邊一排中，前9個(gè)數(shù)都是2位數(shù)，也是整十?dāng)?shù)，最后一個(gè)數(shù)是個(gè)3位數(shù)，一百。123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100除第一行外，每行中前9個(gè)數(shù)十位上的數(shù)相同，個(gè)位上的數(shù)依次是1，2，3，…，9，最右邊的一個(gè)數(shù)是整十?dāng)?shù)（或一百）。從左到右看，123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100在同一橫行中，相鄰的兩個(gè)數(shù)相差1，即后一個(gè)數(shù)總比前一個(gè)數(shù)多1。從左到右看，相鄰的兩個(gè)數(shù)之間差幾??？123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100從左上角到右下角的斜排上，相鄰兩個(gè)數(shù)之間相差11，并且個(gè)位和十位上的數(shù)依次多1（除了100）斜著看：發(fā)現(xiàn)了什么？123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100相鄰兩個(gè)數(shù)之間相差9，并且除第1個(gè)數(shù)10外，個(gè)位上的數(shù)依次少1，十位上的數(shù)依次多1。從右上角到左下角的斜排上，又會(huì)怎樣呢？123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100想一想，填一填。從左到右看，橫行的十位數(shù)相同,個(gè)位加1.從左上向右下斜排的數(shù)，個(gè)位和十位上的數(shù)字依次加1。從右上角向左下角，斜排的數(shù)，個(gè)位上的數(shù)依次減1，十位上的數(shù)依次加1。223233豎著看，個(gè)位數(shù)字相同，十位數(shù)依此加一。123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100想一想，填一填。5968697079123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100想一想，填一填。5666687757765878做題方法：第一步先做橫行，第二步再看豎行，最后才斜著看。歸納總結(jié)依據(jù)百數(shù)表中的規(guī)律，可以完成任何一塊從百數(shù)表上截取下來(lái)的表格。1.在填好的百數(shù)表上涂一涂，看一看，說(shuō)一說(shuō)你的發(fā)現(xiàn)。（1）把個(gè)位上的數(shù)是“0”的涂上綠色。（2）把個(gè)位上的數(shù)是“7”的涂上藍(lán)色。（3）把個(gè)位和十位上的數(shù)相同的涂上黃色。（4）把個(gè)位上的數(shù)比十位上的數(shù)少1的涂上紅色。123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100欣賞123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100欣賞123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100欣賞123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100欣賞123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100欣賞12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747