1、 5 5、4 4、3 3、2 2加几加几 人教新课标版一年级数学上册人教新课标版一年级数学上册 9 + 59 + 5 9 + 39 + 3 8 + 58 + 5 8 + 38 + 3 9 + 49 + 4 9 + 29 + 2 8 + 48 + 4 7 + 57 + 5 5 + 75 + 7 5 + 85 + 8 怎样想能很快地说出得数？怎样想能很快地说出得数？ 4 + 84 + 8 3 + 93 + 9 怎样想能很快地说出得数？怎样想能很快地说出得数？ 1 1 = = 2 2 7 + 57 + 5 5 + 75 + 7 9 + 59 + 5 5 + 95 + 9 3 3 9 + 49 + 4
2、 4 + 94 + 9 8 + 38 + 3 3 + 83 + 8 9 + 29 + 2 2 + 92 + 9 9 + 5 = 8 + 5 = 9 + 4 = 8 + 4 = 9 + 3 = 8 + 3 = 14 13 13 12 12 11 9 + 2 = 7 + 5 = 11 12 1 1 5 + 6 = 5 + 8 = 因为 6 + 5 = 11 所以 5 + 6 = 11 因为 8 + 5 = 13 所以 5 + 8 = 13 11 13 2 2 4 + 7 = 3 + 9 = 因为 7 + 4 = 11 所以 4 + 7 = 11 因为 9 + 3 = 12 所以 3 + 9 = 12 11 12 1. = = 2. 7 + 5 = 9 + 5 = 8 + 4 = 5 + 7 = 5 + 9 = 4 + 8 = 3. 9 + 4 = 8 + 3 = 9 + 2 = 4 + 9 = 3 + 8 = 2 + 9 = 5 + 8 13 3 + 9 12 12 14 12 12 14 12 13 13 11 11 11 11 做一做 谢谢观看
