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二年级下册（2013年10月第1版）《4、练习三》优质课PPT课件下载
Count by 10s.
10 tens make ( ).
100
How many cubes are there？
Count by 100s.
10 hundreds make ( ).
1000
How many cubes are there？
Count from 998 to 1000 by 1s on your counter.
Count from 380 to 410 by 10s on your counter.
Count from 700 to 1000 by 100s on your counter.
800
Count by 1s.
800
798
799
801
802
Count by 2s.
800
796
798
802
804
Count by 3s.