BÀI 13: MULTIPLYING A ONE DIGIT BY A ONE DIGIT NUMBER
BÀI 14: MULTIPLICATION WITHOUT CARRY OVER: PHÉP NHÂN KHÔNG CÓ
DƯ
BÀI 15: MULTIPLICATION BY CARRYING OVER
XEM TẠI ĐÂY http://toantienganhcap1.blogspot.com/2017/08/bai-15-multiplication-by-carrying-over.html
BÀI 16: MULTIPLYING A TWO DIGIT BY A ONE DIGIT NUMBER
BÀI 17: MULTIPLYING A THREE DIGIT BY A ONE DIGIT NUMBER
BÀI 18 : INTRODUCING THE ANGLES.
http://toantienganhcap1.blogspot.com/2017/10/bai-18-introducing-angles.html
BÀI 19: ANGLES - ACUTE, OBTUSE,
RIGHT, STRAIGHT
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