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20以内的进位加法,10+7=,5+10=,9+10=,10+8=,6+10=,10+3=,17,15,19,18,16,13,投篮比赛,9 + 6 =,(每轮2分钟),S6,h6,S9,h9,S69,h69,z,9 + 6 =,5,1,1,10,15,9,9 + 6 =,5,1,1,10,15,9,9 + 6 =,5,4,4,10,15,6,9 + 6 =,5,4,4,10,15,6,9 + 6 =,5,1,10,15,5,4,5,5,5,9 + 6 =,5,1,10,15,5,4,5,5,5,+1,+5,投篮比赛,(每轮2分钟),8 + 5 =,完成练习1:在20数板上计算。,9 + 6 =,5,1,1,10,15,9,8 + 5 =,3,2,2,10,13,8,8 + 5 =,13,3 + 8 =,6,6,想一想,拆哪个数更方便?,3,9 + 5 =,5 + 7 =,=,6,5,5,6,+,2,1,1,4,3,2,4,2,10,10,10,10,11,14,12,12,4,2,10,方法:拆小数,凑大数,