Cau 1: viet 1000 so tu nhien dau tien , hoi chu so 3 co mat bao nhieu lan.

Cau 2:de danh so trang 1 quyen sach nguoi ta  dung  1995 chu so.hoi cuon sach day bao nhieu trang.

Cau 3:Giai thich tai sao :

a/so co 4 chu so xyxy khi chia cho so 2 chu so xy lai co thuong la 101.

b/so co 6 chu so xyvxyv khi chia so co 3 chu so xyv lai co thuong la 1001

Cau 4: Cho day so 4,7,10,13,16,.....

a/tim so thu 100 cua day,so thu n cua day .

b/So 45+23 co mat trong day do ko

Cau 5:tim so tu nhien co 5 chu so,biet rang neu them 2 chu chu so vo dang su so do thi duoc so lon gap 3 lan so do co duoc bang cach viet them chu so 2 vao da truoc so do

 1/  tinh : 1 giờ : 3= ...phút?

 2/ lop 2a co 4 ban; lop 2b co 5 ban du thi violypic cap thanh pho . Cac ban cua hai lop bat tay chuc mung nhau moi khi di moi nguoi mot lan. Hoi co tat ca bao nhieu cai bat tay?Biết rằng các bạn trong cùng lớp ko bat tay nhau.

3/  so be nhat co 3 chu so khac nhau cua phep chia chu so hang tram cho chu so hang chuc bang thuong cua phep chia chu so hang chuc cho hang don vi la so.......

4/ cho day so :0,1,2,3,6,11,...So thich hop tiep theo cua day so do la:...

5/ so lon nhat co 3 chu so khac nhau ma tong cac chu so cua so do bang 21la:....