二年级数学上册按规律填数专项练习 班级 考号 姓名 总分 例1. 按规律填数 (1)15,5,12,5,9,5,( ),( ) 写一写你发现的规律:____________________ (2)5,9,10,8,15,7,( ),( ) 写一写你发现的规律:____________________ 举一反三1:按规律填数。 1. (1)( ),( ),7,34,7,36,7,38 规律:____________________ (2)( ),( ),5,4,9,6,13,8 规律:____________________ 2. (1)25,4,20,4,15,4,( ),( ) 规律:____________________ (2)8,7,10,6,12,5,( ),( ) 规律:____________________ 3. (1)1,16,3,8,9,4,( ),( ) 规律:____________________ (2)40,16,20,8,10,4,( ),( ) 规律:____________________ 例2.仔细观察,找规律填数 0,1,2,3,6,7,( ),( ) 写一写你发现的规律: ____________________ 1 举一反三2:仔细观察,找规律填数。 1.3,6,12,( ),( ) 规律:____________________ 2.1,2,4,5,10,( ),( ) 规律:____________________ 3.3,6,5,10,9,( ),( ) 规律:____________________ 4.30,15,14,7,6,( ),( ) 规律:____________________ 5.2,3,4,3,5,4,5,4,5,6,( ),规律:____________________ 例3.仔细观察,找规律填数 (1)0,1,4,9,( ),( ),36 写一写你发现的规律:____________________ (2)2,4,( ),( ),32,64 写一写你发现的规律:____________________ (3)1,3,7,( ),31,63 写一写你发现的规律:____________________ 举一反三3.按规律填数 1.4,9,16,( ),( ),49 写一写你发现的规律:____________________ 2.81,( ),49,36,( ) 写一写你发现的规律:____________________ 3.1,2,4,8,( ),( ) 写一写你发现的规律:____________________ 2 ) ( 3 本文来源:https://www.wddqw.com/doc/86cd4b4be73a580216fc700abb68a98270feacca.html