Bai 25 Diem, Doan Thang, Duong Thang, Duong Cong, Ba Diem Thang Hang

Bai 13 Bai Toan Ve Nhieu Hon,it Hon Mot So Don Vi

Bai 32 Luyen Tap Chung

Bai 7 Phep Cong Qua 10 Trong Pham Vi 20

Bai 24 Luyen Tap Chung

Bai 1 On Tap Cac So Den 100

Bai 36 On Tap Chung

Bai 29 Ngay Gio, Gio Phut

Bai 22 Phep Tru (co Nho) So Co Hai Chu So Voi So Co Mot Chu So

Bai 8 Bang Cong Qua 10

Bai 21 Luyen Tap Chung

Bai 18 Luyen Tap Chung