二年級下冊數(shù)學課件-2.2 數(shù)射線（千） ▏滬教版 18張

1、數(shù)射線（千）010203040506070809010025529比一比925520102030405060708090100相鄰的數(shù)25529（ ）（ ）（ ）（ ）（ ）（ ）242651538102552901020304050607080901002552相鄰的整十數(shù)25529（ ）（ ）（ ）（ ）（ ）（ ）203050600109010203040506070809010025529200?010020030040050060070080090010005015025035045055065075085095020350530420100020530420能不能準確地找到183？

2、20350420530100001002003004005006007008009001000501502503504505506507508509502053042020350比位數(shù)，位數(shù)多的數(shù)就大。1000420530兩位數(shù)三位數(shù)四位數(shù)01002003004005006007008009001000501502503504505506507508509502053042020 1000350 420530位數(shù)相同時，從高位比起。100120150170110130140160180190200183100120150170110130140160180190200abcdefga=106b

3、=132f=183c=149d=165g=199e=171字母所表示的數(shù)：100120150170110130140160180190200abcdefga=106b=132f=183c=149d=165g=199e=171106105107149 e f148150170172182184字母所表示的數(shù)：相鄰的數(shù)：（-1，+1）171183100120150170110130140160180190200abcdefga=106b=132f=183c=149d=165g=199e=171字母所表示的數(shù)：相鄰的整十數(shù)：（去尾，湊十）相鄰的整百數(shù)？106100110149 e f1401501701801801901711831064319001002004005008001000106-6=100106+94=200431-31=400431+69=500900-100=800900+100=1000去尾湊百相鄰的整百數(shù)？想一想，算一算P17333555382503070391303030632639450449100098874375327373210099304310640460想一想，比一比343158787450505想一想，試一試0101236789想一想，找一找在數(shù)射線上，哪個數(shù)在0和600的正中位置？ 0100200300400500 6007008009001