第,1,课时 数松果,北师,二年级上册,20,25,30,35,40,45,5,5,5,5,5,5,5,5,15,5,25,10,35,15,一五得五,二五一十,三五十五,45,20,四五二十,55,25,五五二十五,56,30,五六三十,57,35,五七三十五,58,40,五八四十,59,45,五九四十五,乘法口诀是我们祖先留下来的，已经有两千多年的历史了。它读起来顺口，记住这些口诀很有用！,5,3,15,个,3,5,15,（个）,三五十五,5,4,20,个,4,5,20,（个）,四五二十,2.,填一填。,15,20,25,30,35,40,45,3.,对口令。,4.,填一填。,5,5,5,5,5,1,2,3,4,0,1,0,2,0,3,0,4,5.,先在图上圈一圈，再数一数，说一说。,