西师大版小学数学二年级上学期第一单元第1课时《乘法的初步认识》

34 +17 =       51 – 19 =     28 + 27 – 25=       100 – 48 + 37 =     6 + 6 + 6 =

6 × 3 =      4× 4=       3 ×3 =           5×2 =            2×4 =

加法算式：    乘法算式：

4个2相加                                            2×4=8

6+6+6                       4×2                  5乘4

4 + 4+4 +4 +4           6×3                 乘数是6和3

3+3+3+3+3+3           5×4                 2+2+2+2

5 +5 + 5 +5                                        3×6

2乘4                                                    4×5