BÀI 11: ADDITION TABLE UPTO 10
BÀI 12: THE MINUS SIGN AND SUBTRACING
BÀI 13: BASIC SUBTRACING
BÀI 14: NUMBERS ELEVEN AND TWELVE
BÀI 15: SUBTRACING USING NUMBER LINE
BÀI 16: SEVENTEEN, EIGHTEEN AND NINETEEN
XEM TẠI ĐÂY http://toantienganhcap1.blogspot.com/2017/08/bai-16-seventeen-eighteen-and-nineteen.html
BÀI 17: INTRODUCING TWENTY TO TWENTY NINE
XEM TẠI ĐÂY http://toantienganhcap1.blogspot.com/2017/08/bai-17-introducing-twenty-to-twenty-nine.html
BÀI 18: INTRODUCING THIRTY TO THIRTY NINE
XEM TẠI ĐÂY http://toantienganhcap1.blogspot.com/2017/08/bai-18-introducing-thirty-to-thirty-nine.html
BÀI 19: INTRODUCING FORTY TO FORTY NINE
XEM TẠI ĐÂY http://toantienganhcap1.blogspot.com/2017/08/bai-19-introducing-forty-to-forty-nine.html
BÀI 20: INTRODUCING FIFTY TO FIFTY NINE
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